1972a. Flight directions of passerine migrants in daylight and darkness: a radar and direct visual study p. 129-137. Galler, S. R., et al. ed. In: Animal orientation and navigation symp. N.A.S.A. Wash., D.C. 606 p. 1972b. Behavioral responses of migrating birds to daylight and darkness: a radar and direct visual study. Wilson Bull. 84: 136-148. Geroudet, P. 1954. Des oiseaux migrateurs trouvés sur la glacier de Khumbu dans l'Himalaya. Nos Oiseaux 22: 254. Godfrey, W. E. 1966. The birds of Canada. Natl. Mus. Can. Bull. 203, Biol Series No. 73. 428 p. Gordon, D. A. 1948 Some considerations of bird migration: continental drift and bird migration. Science (Wash., D.C.) 108: 705-711. Graber, R. R. 1965. Night flight with a thrush. Audubon 67: 368-374. 1968. Nocturnal migration in Illinois different points of view. Wilson Bull. 80(1): 36-71. Graber, R. R. and W. W. Cochrane. 1959. An audio technique for the study of nocturnal migration of birds. Wilson Bull. 71: 220-236. Griffin, Dr. R. 1940. Homing experiments with Leach's Petrels. Auk 57(1): 61-74. 1943. Homing experiments with Herring Gulls and Common Terns. Bird-Banding 14(1 and 2): 7-33. Griffin, D. R. 1958. Listening in the dark. Yale Univ. Press, New Haven. 413 p. 1964. Bird migration. Nat. Hist. Press. Garden City, N.Y. 180 p. Griffin, D. R. and R. J. Hock. 1948. Experiments on bird navigation. Science (Wash., D.C.) 107(2779): 347-349. 1949. Airplane observations of homing birds. Ecology 30: 176-198. Grinnell, J. 1931. Some angles in the problem of bird migration. Auk 48: 22-32. Gross, A. O. 1927. The Snowy Owl migration of 1926-27. Auk 44: 479-493. 1947. Cyclic invasions of the Snowy Owl and the migration of 1945-46. Auk 64(4): 584-601. Gwynn, A. M. 1968. The migration of the Arctic Tern. Aust. Bird Bander 6(4): 71-75. Haartman, L. von. 1968. The evolution of resident vs. migratory habit in birds: some considerations. Ornis Fenn. 45(1): 1-7. Hagar, J. A. 1966. Nesting of the Hudsonian Godwit at Churchill, Manitoba. Living Bird 5: 5-43. Hamilton, W. J. III. 1962a. Bobolink migratory pathways and their experimental analysis under night skies. Auk 79(2): 208-233. 1962b. Celestial orientation in juvenile waterfowl. Condor 64(1): 19-23. Harrisson, T. H. 1931. On the normal flight speeds of birds. Br. Birds 25: 86-96. Hassler, S. S., R. R. Graber and F. C. Bellrose. 1963. Fall migration and weather: a radar study. Wilson Bull. 75: 56-77. Haugh, J. R. and T. J. Cade. 1966. The spring hawk migration around the southeastern shore of Lake Ontario. Wilson Bull. 78(1): 88-110. Hebrard, J. J. 1971. The nightly initiation of passerine migration in spring: a direct visual study. Ibis 113(1): 8-18. Hochbaum, H. A. 1955. Travels and traditions of waterfowl. Univ. of Minn. Press, Minneapolis. 301 p.