The purpose of bird censuses and how to take them
By: May Thacher Cooke.
Edition: Revised edition.
Series: U.S. Dept. of agriculture. Department circular -- no. 261; Department circular (United States. Dept. of Agriculture) -- 261.
Publisher: U.S. Dept. of Agriculture
Published: 1927
Place of publication: Washington, D.C
Language: eng
Subjects: Bird populations.