Instruction in farm mechanics; suggestions for developing training programs in farm mechanics in vocational agriculture - Hollenberg, Alvin Herbert, 1901-; Johnson, Elmer John, 1896- ([Washington] U.S. Dept. of Health, Education, and Welfare, Office of Education; [for sale by the Superintendent of Documents, U.S. Govt. Print. Off., 1964)
"OE-81009."
Keywords: Agricultural engineering -- Study and teaching; Agricultural education -- United States