Value of swallows as insect destroyers
Contributors: Henshaw, Henry W. 1850-1930.
Series: Biological Survey Circ. No. 56
Publisher: [s.n.]
Published: 1907
Place of publication: Washington, D.C
Format: Microform
Subjects: United States. Bureau of Biological Survey -- Public records.; Swallows.; Insect pests -- Control.