The purpose of bird censuses and how to take them
By: by May Thacher Cooke.
Contributors: United States. Bureau of Biological Survey.
Series: Department circular / United States Dept. of Agriculture -- 261; Department circular (United States.  Dept. of Agriculture) -- 261
Publisher: G.P.O.
Published: 1923
Place of publication: Washington, D.C
Language: eng
Subjects: Bird populations -- United States
Other titles: Bird censuses and how to take them
Notes: Caption title.

Running title: Bird censuses and how to take them.

Contribution of the Bureau of Biological Survey.