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1873a. On the carotid arteries of birds. Proc. Zool. Soc. London, 1873:147-472. 

 1873b. On certain muscles of the thigh in birds and their value in classification. Pt. I. 



Proc. Zool. Soc. London, 1873:626-644. 

 1874. On certain muscles of the thigh in birds and their value in classification. Pt. II. 



Proc. Zool. Soc. London, 1874:111-123. 



Gatke, H. 



1891. Die Vogelwarte Helgoland, xii + 609 pp. Braunschweig. 



Glenny, F. H. 



1940. A systematic study of the main arteries in the region of the heart. Aves. Anat. 

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Gloger, B. von 



1833. Das Abandern der Vogel durch Einfluss des Klima's. xxix + 159 pp. Breslau: 

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Gould, J. 



1840-1848. The Birds of Australia. 7 vols., 600 col. pis. London. 

 1851-1869. (Suppl. to above.) iv + 158 pp., 81 col. pis. London. 



1849-1861. A Monograph of the Trochilidae, or Family of Humming-Birds. 5 vols. 

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Grasse, p. p. et al. 



1950. Oiseaux. Vol. 15 of Traite de Zoologie, Anatomie, Systematique, Biologic. 1164 

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Groebbels, F. 



1932-1937. Der Vogel. 2 vols. Berlin: Gebr. Borntraeger. 



Harris, H. 



1928. Robert Ridgway. Condor, 30:5-118. 



Hartert, E. 



1903-1923. Die Vogel der palaarktischen Fauna. 3 vols. Berlin and London. 



Hartert, E., H. F. Witherby, F. C. R. Jourdain, and N. F. Ticehurst 



1912. A Hand-List of British Birds, with an Account of the Distribution of Each 

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Hartlaub, G. 



1857. System der Ornithologie Westafrica's. Ixvi + 280 pp. Bremen. 



Heilmann, G. 



1926. The Origin of Birds, vi + 208 pp. London: Witherby. 



Heinroth, O. 



1910. Beitrage zur Biologic, namentlich Ethologie und Psychologie der Anatiden. 

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Heinroth, O., and M. Heinroth 



1926-1928. Die Vogel Mitteleuropas. 3 vols. Berlin: Hugo Bermiihler. 



1941. Das Heimfinde-Vermogen der Brieftaube. Journ. Ornithol., 89:213-256. 



Hellmayr, C. E. 



1918-1949. [See Cory, C. B., C. E. Hellmayr, and H. B. Conover.] 



Herrick, F. H. 



1901. The Home Life of Wild Birds, xix + 148 pp. New York and London: Knicker- 

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