Ecology of three species of bumble bees in southwestern Washington
By: [Carl Johansen].
Series: Technical bulletin -- 57.; Technical bulletin (Washington Agricultural Experiment Station) -- 57.
Publisher: Washington Agricultural Experiment Station, College of Agriculture, Washington State University
Published: 1967
Place of publication: [Pullman, Wash.]
Language: eng
Number of pages: 12
Subjects: Bumblebees -- Ecology
Notes: Cover title.

Bibliography: p. 11-12.