[by C.S. Coleman ... and others ; Correlation by G.H. Robinson] ; United States Department of Agriculture, Soil Conservation Service in cooperation with Virginia Agricultural Experiment Station
[by H.C. Porter ... and others ; Correlation by W.E. Hearn and W.S. Ligon] ; United States Department of Agriculture, Soil Conservation Service in cooperation with Virginia Agricultural Experiment Station
[by E.F. Henry ... and others ; report revised by R.C. Jurney] ; United States Department of Agriculture, Soil Conservation Service in cooperation with Virginia Agricultural Experiment Station
by H.C. Porter ... [and others] ; United States Department of Agriculture, Agricultural Research Administration, Bureau of Plant Industry, Soils, and Agricultural Engineering in cooperation with the Virginia Agricultural Experiment Station and the Tennessee Valley Authority
United States Department of Agriculture, Natural Resources Conservation Service ; in cooperation with Virginia Polytechnic Institute and State University, and United States Department of Agriculture, Forest Service
[by J.W. Clay ... and others] ; United States Department of Agriculture, Soil Conservation Service in cooperation with Virginia Agricultural Experiment Station