Preliminary report on insect enemies of forests in Northwest
Subtitle: account of results gained from reconnaissance trip made in spring and early summer of 1899.
Contributors: Hopkins, A. D.
Series: Entomology Bur. Bull. New Series No. 21
Publisher: U.S. G.P.O.
Published: 1899
Place of publication: [Washington, D.C.]
Format: Microform
Subjects: Insects.