Instruction in farm mechanics; suggestions for developing training programs in farm mechanics in vocational agriculture. - Hollenberg, Alvin Herbert, 1901- ([Washington] U.S. Dept. of Health, Education, and Welfare, Office of Education, 1957)
With Supervisory personnel development / Earl M. Bowler. Washington : U.S. Dept. of Health, Education, and Welfare. Office of Education, 1957. Bound together subsequent to publication.
Keywords: Agricultural engineering; Agricultural education -- United States