J.D. Long. "Training Needs of Agricultural Engineers in the Soil and Water Field," panel paper presented at the 43rd annual meeting of the American Society of Agricultural Engineers, Washington, D.C., June 21, 1950

J.D. Long. "Training Needs of Agricultural Engineers in the Soil and Water Field," panel paper presented at the 43rd annual meeting of the American Society of Agricultural Engineers, Washington, D.C., June 21, 1950, MS0256-015392, Box: 47, Folder: 45. USDA Division of Agricultural Engineering Records, MS0256. National Agricultural Library Special Collections. http://localhost:8081/repositories/4/archival_objects/89546 Accessed February 20, 2026.