The birds of El Paso County, Colorado
By: by Charles E. H. Aiken and Edward R. Warren
Contributors: Colorado College
Publisher: Published by the authority of the Board of Trustees of Colorado College
Published: 1914
Place of publication: [Colorado Springs
Language: eng
Subjects: Birds -- Colorado -- El Paso County.
Notes: Detached from the Colorado College Publication's Science series, v. 12, no. 13, pts 1-2 (also called General series, no. 74)

Includes index.