A key to species of American owls
By: by Leon Kelso, U.S. Biological survey ; with a list of the owls of the Americas, by Estelle H. Kelson.
Contributors: Kelso, Estelle H.
Series: Biological leaflet -- no. 4
Publisher: Intelligencer printing co.
Published: 1934
Place of publication: Lancaster, Pa
Language: eng
Number of pages: 101
Subjects: Owls