Chicago

Hopkins, A. D. (Andrew Delmar), 1857-1948, and United States. Division of Entomology. 1899. Preliminary Report On the Insect Enemies of Forests In the Northwest : an Account of the Results Gained From a Reconnaissance Trip Made In the Spring and Early Summer of 1899. : Washington, D.C. : U. S. Department of Agriculture, Division of Entomology.