by Arthur E. Taylor ... [and others] ; United States Department of Agriculture, Bureau of Plant Industry in cooperation with the University of Georgia, College of Agriculture
by W.E. Tharp ... [and others] ; United States Department of Agriculture, Bureau of Plant Industry in cooperation with the Cornell University Agricultural Experiment Station
by A.C. Anderson ... [and others] ; United States Department of Agriculture, Bureau of Plant Industry in cooperation with the University of California Agricultural Experiment Station
by L.R. Smith ... [and others] ; United States Department of Agriculture, Bureau of Plant Industry in cooperation with the Purdue University Agricultural Experiment Station
R. Earl Storie ... [and others] ; United States Department of Agriculture, Bureau of Plant Industry in cooperation with the University of California Agricultural Experiment Station