Studies on the biology and control of chiggers
By: by H.E. Ewing
Series: Bulletin / United States Department of Agriculture -- no. 986; Bulletin of the U.S. Department of Agriculture -- no. 986.
Publisher: U.S. Dept. of Agriculture
Published: 1921
Place of publication: Washington, D.C
Language: eng
Number of pages: 19
Subjects: Chiggers (Mites)
Notes: Caption title.

"December 3, 1921."

Bibliography: p. 19.