Hadidi, M. Nabil El. (1978). Adumbratio Florae Aethiopicae. Part 30. Zyhopyyllaceae. 21 line drawings; 4 fold-out maps. Webbia 33(1): 45-101.[457]

Hadidi, M. Nabil El. (1985). Flora of Tropical East Africa. Zygophyllaceae. Prepared at the Royal Botanic Gardens/Kew with assistance from the East African Herbarium. FTEA Editor: R.M. Polhill. ISBN 90-6191-324-1; pp 15; 3 line drawings, artist G. Papadopoulos. See pp 12-14; figure 3. Published on behalf of the East African Governments. Rotterdam/Boston: A.A. Balkema.[458]

Hahn, D.E. (1978). A brief review of the genus Leptotyphlops (Reptilia, Serpentes, Leptotyphlopidae) of Asia with description of a new species. Journal of Herpetology 12(4): 477-490.[459]

Haines, S.B. (1845). II. Memoir of the South and East Coasts of Arabia. Journal of the Royal Geographical Society 15: 104-160.[460]

Haines, S.B. (1854). V. A description of the Arabian Coast, commencing from the entrance of the Red Sea, and continuing as far as Messenaat, in Lat. 15º 3' North, Long. 53º 43' 25" East, with some observations relative to its population, Government, Commerce, etc. - By Captain S.B. Haines of the Indian Navy. Transactions of the Bombay Geographical Society 11: 60-211. Bombay: The 'Times' Press.[461]

Hale, M.E. (1990). A synopsis of the Lichen Genus Xanthoparmelia (Vainio) Hale (Ascomycotina, Parmeliaceae). 2 figures; 433 photographs in 71 plates. See pp 94-95. Smithsonian Contributions to Botany 74: 1-250.[462]

Hall, B.P. and Moreau, R.E. (1970). An Atlas of speciation in African passerine birds. British Museum Publication No. 680. Standard Book No. 56500680-0; pp xv + 423. London: Trustees of the British Museum (Natural History).[463]

Halliday, F. (1990). Revolution and foreign policy. The case of South Yemen 1967-1987. ISBN 0-521-32956-X; pp xvi + 315; see page 203. Cambridge: Cambridge University Press.[464]

Halliday, P. (1984). Flora of Tropical East Africa. Myrsinaceae. Prepared at the Royal Botanic Gardens/Kew with assistance from the East African Herbarium. FTEA Editor: R.M. Polhill. ISBN 90-6191-310-1; pp 21; 5 line drawings, artist Pat Halliday. See pp 6-8; Figure 2. Rotterdam: A.A. Balkema.[465]

Hallier, H. (1893). Convolvulaceae Africanae. See pp 82, 90, 93, 97, 99, 129-130, 140-141, 145-146. Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie herausgegeben von A. Engler 18(1): 81-160. Leipzig: Wilhelm Engelmann.[466]

Hampson, G.F. (1899). The Expedition to Sokotra. VI Descriptions of one new genus and fourteen new species of moths. Bulletin of the Liverpool Museums 2(2): 35-39; 1 coloured plate (Plate XX).[467]

Hampson, G.F. (1903). Arthropoda. Insecta: Lepidoptera - II. Phalaenae. Moths. I: 321. I. The moths of Sokotra: 321-336. II. The moths of Abd-el-Kuri: 337-338. Colour Plate XX Moths from Sokotra and Abd-el-Kuri. Depicts 26 species; artist E.C. Knight. In Natural history of Sokotra and Abd-el-Kuri, Editor: H.O. Forbes. Bulletin of the Liverpool Museums (Special Bulletin): 319-340.[468]

Harding, T.B.C. (1979). Aloes of the world: a checklist, index, and code. Excelsa. The Aloe, Cactus and Succulent Society of Zimbabwe 9: 57-94.[469]

Hariri, K. (1996). Soqotra Island: Integrating Development and Resource Management. In Dumont, H.J.(Editor), Proceedings of the First International Symposium on Soqotra Island: Present and Future. 1:257-264. New York: United Nations Publications.[1057]

Harley, M (adeline). M. and Ferguson, I.K. (1982). Pollen morphology and taxonomy of the tribe Menispermeae (Menispermaceae). 78 micro-photographs on 8 plates; 1 table. Kew Bulletin 37(3): 353-366.[470]

Harley, Madeline M. (1991). The pollen morphology of the Sapotaceae. 43 figures (Nos 5-43 are micro-photographs). Kew Bulletin 46(3): 379-491.[471]

Harrison, D.L. (1957). Some systematic notes on the trident bats (Asellia tridens E.Geoffrey) of Arabia. Mammalia, Paris 21(1): 1-8.[472]

Harrison, D.L. (1964-1972). The mammals of Arabia. Volume 1: Introduction. Insectivora. Chiroptera. Primates. 1964. pp xx + 1-192. Volume 2: Carnivora. Artiodactyla. Hyracoidea. 1968. pp xiv + 193-382. Volume 3: Lagomorpha. Rodentia. 1972. pp xviii + 383-670. London: Ernest Benn Limited.[473]

Hartlaub, G. (1881). On the birds collected in Socotra and Southern Arabia by Dr. Emil Riebeck. Proceedings of the Scientific Meetings of the Zoological Society of London for the Year 1881. 1881: 953-959 with 1 coloured plate.[474]

Hassan, Abdisalam Sheikh and Styles, B.T. (1990). A conspectus of Somali Acacias. ISBN 0-85954-285-8; pp viii + 122; 43 line drawings, artist Rosemary Wise; 14 colour photographs on 4 plates; 20 maps. See pp 107-109; figure 41; 2 colour photographs on plate 4. Somali Forestry Series Number 4. Oxford: Oxford Forestry Institute, Department of Plant Sciences, University of Oxford; and the Overseas Development Administration.[475]

Hasse, P. (nd, c1988). Ecological information for the exploration of plant genetic resources of Socotra, Democratic Republic of Yemen. Processed; pp 8; map. Nicosia, Cyprus: International Board for Plant Genetic Resources.[476]

Hawkes, Jacquetta. (1982). Mortimer Wheeler. Adventurer in archaeology. ISBN 0-297-78056-5; pp xii + 387; 8 line drawings; 37 photographs in 16 plates; 1 plan; 1 map. See pages 348-349. London: Weidenfeld & Nicolson.[477]

Hawkes, Jacquetta. (1984). Mortimer Wheeler. Adventurer in archaeology. ISBN 0-349-11647-4; paperback reprint; pp x + 387; figures; 8 pages photographs; 1 map. London: Abacus.[478]

Hebert, Jacques (2004). Atlantis Rediscovered: An Orbis Enigma Book (Orbis Enigma Series) . Carnot USA Books Inc., NY; 1st edition, pps 192 ISBN-10: 1592090397 [1177]

Heidel, A. (1946). The Gilgamesh Epic and Old Testament parallels. pp ix + 269. Chicago: The University of Chicago Press.[479]

Heidel, A. (1963). The Gilgamesh Epic and Old Testament parallels. pp ix + 269; reissue of 1946 edition. Chicago and London: The University of Chicago Press.[480]

Heimes, P. (1987). Beitrag zur Systematik der Fächerfinger (Sauria: Gekkonidae: Ptyodactylus). Salamandra 23 (4): 212-235.[1107]

Hennig, R. (1948). Sokotra als Ostliche Insula Fortunata des Altertums. Petemann's Geographishe Mitteilungen 92(1): 89-90.[481]

Hepper, F.N. (1969). Arabian and African frankincense trees. The Journal of Egyptian Archaeology 55(1): 66-72; 2 figures; 2 monochrome plates (4 species; 2 species). London: The Egypt Exploration Society.[482]

Hepper, F.N. (1971a). Boswellia nana Hepper. Burseraceae. Tribus Bursereae. Hooker's Icones Plantarum, 5th Series, 7(4): T 3676, pp 2 with 1 line drawn plate.[483]

Hepper, F.N. (1971b). Boswellia popoviana Hepper. Burseraceae. Tribus Bursereae. Hooker's Icones Plantarum, 5th Series, 7(4): T 3677, pp 2 with 1 line drawn plate.[484]

Herbulot, C. (1994). Geometridae (Lepidoptera) recoltes a Sokotra par le Dr. J.-G. Canu. 4 text figures. Lambillionea. Revue Internationale d'Entomologie, Bruxelles 94(3): 389-393.[485]

Herington, John (1955). Air war against Germany and Italy 1939-1943. In Australia in the War of 1939-1945. Series 3 (Air). Volume III. pp xvii + 731; figures; maps. See pp 356-357. Canberra: Autralian War Memorial.[486]

Hertslet, Sir Edward (1880). A complete collection of the treaties and conventions and reciprocal regulations at present subsisting berween Great Britain and foreign powers and of the laws, decrees, Orders in Council, etc., concerning the same; so far as they relate to commerce, navigation, the slave trade, post-office communications, copyright, etc., and to the privileges and interests of the high contracting parties. Compiled from authentic documents by Sir Edward Hertslet, C.B., Librarian and Keeper of the Papers, Foreign Office. 14 volumes. Volume 14: 1002-1003. Agreement between the British Government and the Sultan of Socotra. Non-cession of Island except to British Government. Assistance to wrecked vessels. January 23, 1876. London: Butterworth and Harrison.[487]

Heuglin, M.T. von. (1869-1873). Ornithologie Nord-Ost Africas, der Nilquellen und Küsten-Gebiete des Rothen Meers. 3 volumes. London: Cassel.[488]

Heuglin, T. von. (1861). Skizze der Insergruppe von Sokotra. Mittheilungen aus Justus Perthes' Geographischer Ansalt uber Wichtige Neue Erforschungen auf dem Gesammtgebiete der Gerographie von Dr. A. Petermann. 1861(4): 149-151. [Petermann's Geogr. Mittheilungen 1861(4): 149-151].[489]

Hickinbotham, T. (1958). Aden. pp xiv + 242; 13 black & white photographs; see pages 159-161 and 167-168. London: Constable and Company Ltd.[490]

Hirth, H. and Carr, A. (1970). The green turtle in the Gulf of Aden and the Seychelles Islands. Verhandelingen der koninklijke Nederlandse Akademie van Wternschappen, Afd Natuurkunde. Tweede Reeks - Deel LVIII. No. 5, pp 44. Amsterdam - London: North Holland Publishing Co.[491]

Hirth, H.F.. (1968). The green turtle resource of South Arabia and the status of the green turtle in the Seychelles Islands. A report to the Governments of Southern Yemen and the Seychelles Islands. FAO No. TA 2467. Rome: Food and Agriculture Organization of the United Nations.[492]

Hooker, J.D. (1881a). Begonia Socotrana. Native of the Island of Socotra. pp 2 with 1 coloured plate. Curtis's Botanical Magazine, 3rd series, 37: T. 6555 B Hooker, J.D. (1881b). Babiana Socotrana. Native of the Island of Socotra. pp 2 with 1 coloured plate. Curtis's Botanical Magazine, 3rd Series, 37: T. 6585 B Hooker, J.D. (1881d). New gardens plants. Begonia socotrana, Hook. fil., sp.n. 1 figure.[493]

Hooker, J.D. (1901). Kalanchoe farinacea. Native of Socotra. pp 2; 1 colour plate, artist M.S. Curtis's Botanical Magazine, 3rd Series, 57: t. 7769.[494]

Hooker, J.D. (1902a). Euryops socotranus. Native of Socotra. pp 2; 1 colour plate, artist M.S. Curtis's Botanical Magazine, 3rd Series, 57(6): t. 7838.[495]

Hooker, J.D. (1902a). Hibiscus scotti. Native of Socotra. pp 2; 1 colour plate, artist M.S. Curtis's Botanical Magazine, 3rd Series, 57(1): t. 7816.[496]

Hooker, J.D. (1885). Exacum affine. Native of the Island of Socotra. pp 2; 1 line drawing, artist M.S. Curtis's Botanical Magazine, 3rd Series, 41(7): t. 6824.[497]

Horwood, F.K., Mortimer, K.V. and Parr, C.A.E. (1964). Exotic Xerophytes 2. Dorstenia. National Cactus and Succulent Journal 19: 59-61.[501]

Horwood, F.K. (1970). Exotic xerophytes - 7. Some notes on the succulents of Socotra. [Part 1]. 8 photographs National Cactus and Succulent Journal 25(4): 103-105[498]

Horwood, F.K. (1971). Exotic xerophytes - 7. Some notes on the succulents of Socotra. [Part 2]. 21 photographs National Cactus and Succulent Journal 26(4): 106-111[499]

Horwood, F.K. (1974). Some notes on the genus Dorstenia. Part 1. Cactus and Succulent Journal of the Cactus and Succulent Society of America 46(5): 223-229.[500]

Hoskiaer, V. (1877). Socotra. Det Danske Geograpiske Selskabs Tidsskrift 1(1): 66.[502]

Hoskins, H.L. (1928). British routes to India. pp xiii + 494. New York: Longmans and Co.[503]

Hourani, G.F. (1951). Arab seafaring in the Indian Ocean in ancient and early medieval times. pp xiii + 131. Princetown, New Jersey: Princeton University Press.[504]

Hunt, D.R. and Lebrun, J.-P. (1975). A new Wellstedia (Boraginaceae) from Ethiopia. Kew Bulletin 30(2): 222.[506]

Hunt, D.R. (1969). Wellstedia socotrana I.B. Balf. (t. 3665), Wellstedia dinteri Pilger var. dinteri (t. 3666), Wellstedia dinteri Pilger var. gracilior D.R. Hunt (t. 3667). Boraginaceae. Subfamilia Wellstedioideae. pp 7; 3 plain plates, artist E.M.S. Hooker's Icones Plantarum, Fifth Series, 7(3): t. 3665-t. 3667.[505]

Hunter, F.M. and Sealy, C.W.H. (1886). An account of the Arab tribes in the vicinity of Aden. Compiled under the orders of Government [of India]. pp 70 + lxxxiii + 3 + 4; 14 genealogical tables; 2 maps. Bombay: The Government Central Press.[511]

Hunter, F.M. (1876). Socotra. Bombay Gazette, Bombay. Thursday, 18 May, 1876[507]

Hunter, F.M. (1877a). Notes on Socotra. Journal of the Royal Anthropological Institute 7: 364-372.[508]

Hunter, F.M. (1877b). An Account of the British Settlement of Aden in Arabia. pp xii + 232; 2 coloured maps. [See pages 157-158]. London: Trubner & Co.[509]

Hunter, F.M. (1878). Notes on Socotra. Report of the Forty-seventh Meeting of the British Association for the Advancement of Science held at Plymouth in August 1877. 47-118.[510]

Huntingford, G.W.B. (1980). The Periplus of the Erthraean Sea by an unknown author. With some extracts form Agatharkhides 'On the Erythraean Sea'. Translated and edited by G.W.B. Huntingford. ISBN 0-904180-05-0; pp xiv + 225; 9 figures; 1 photograph; 11 maps. See pp 151, 37, 76, 84, 103, 123-124. London: The Hakluyt Society.[512]

Hutchinson, J. (1926-1934). The families of flowering plants. Arranged according to a new system based on their probable phylogeny. 2 volumes; figures. London: Macmillan.[513]

Hutchinson, J. (1959). The families of flowering plants. Arranged according to a new system based on their probable phylogeny. Second edition. 2 volumes; pp Oxford: Oxford University Press.[514]

Hutchinson, J. (1973). The families of flowering plants. Arranged according to a new system based on their probable phylogeny. Third edition. pp xx + 968. Oxford: Clarendon Press.[515]

Hutterer, R. and Harrison, D.L. (1988). A new look at the shrews (Soricidae) of Arabia. Bonner zoologische Beiträge 39(1): 59-72.[1101]

Huxley, A. (Editor) (1963). Standard encyclopedia of the world's oceans and islands. pp 383. London: Weidenfeld & Nicolson (Educational) Ltd.[516]