North American Phenology Program

HISTORICAL SUMMARIES (PDF)


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	HISTORICAL SUMMARIES (PDF) Memorandums of the United States Department of Agriculture, Bureau of Biological Survey, Washington, D.C. To All Bird Observers of the Biological Survey, May 12, 1936 Instructions To Bird Migration Observers, August 1941 Bird Migration, Memorandum No. 1, April 1, 1936 Bird Migration, Memorandum No. 2, March 1, 1937 Bird Migration, Memorandum No. 3, April 30, 1938 Bird Migration, Memorandum No. 4, June 15, 1939. Re: Spring Migration, 1938 Bird Migration, Memorandum No. 5, November 30, 1939. Re: Fall Migration, 1937 and 1938 Bird Migration Memorandum No. 6, August 30, 1940. Re: Bird Migration Study, 1889-1938 Bird Migration Memorandum No. 7, June 16, 1941. Re: Spring Migration, 1939 and 1940 Bird Migration Memorandum No. 8, April 1951. Section of Distribution and Migration of Birds.