Simple device for opening cotton bolls
By: Edgar W. Clark
Contributors: United States. Agricultural Research Service
Series: ARS -- 33-41; ARS (Series) (United States. Agricultural Research Service) -- 33-41.
Publisher: U.S. Dept. of Agriculture, Agricultural Research Service
Published: 1957
Place of publication: [Washington, D.C.?]
Language: eng
Subjects: Cotton; Equipment and supplies; Boll weevil; Control; Insect pests
Notes: Caption title.

"July 1957."