Agricultural Communications Documentation Center, Funk Library, University of Illinois Box: 23 Document Number: B02409
Notes:
#946, Harold Swanson Collection. Review of Extension Research 1946/47-1956, Extension Service Circular 506, U.S. Department of Agriculture, Washington, D.C., University Park, PA : The Pennsylvania State University, Agricultural Extension Service, [19-]. 16 p.
Agricultural Communications Documentation Center, Funk Library, University of Illinois Box: 30 Document Number: B02984
Notes:
#950, Harold Swanson Collection. Review of Extension Research 1946/47-1956, Extension Service Circular 506, U.S. Department of Agriculture, Washington, D.C., Washington, D.C. : U.S. Department of Agriculture, Cooperative Extension Work in Agriculture and Home Economics, 1948. 12 p. (Extension Service Circular No. 453). Extension Circular 453