Extension methods and their relative effectiveness
By: by M.C. Wilson.
Contributors: United States. Dept. of Agriculture.
Series: Technical bulletin / United States Department of Agriculture -- no. 106; Technical bulletin (United States. Dept. of Agriculture) -- no. 106.
Publisher: U.S. Dept. of Agriculture
Published: 1929
Place of publication: Washington
Language: eng
Number of pages: 48
Subjects: Agricultural extension work.
Notes: Caption title.

Bibliography on extension studies: p. 46-47.