Diffusion research needs /
Bohlen, Joe M.,author.
Coughenour, C. Milton,author.
Lionberger, Herbert F.(Herbert Frederick),1912-author.
Rogers, Everett M.,author.
University of Missouri.Agricultural Experiment Station.
Title from front cover.
Includes bibliographical references (pages 31-37).
Communication in agriculture.
Agricultural communicators.
Agricultural extension work.
Agricultural communicators.
Agricultural extension work.
Communication in agriculture.