Yazar
William Gettys
4 cilt bulundu.
Samuel Oscar Perkins, William Gettys, United States. Bureau of Plant Industry, North Carolina Agricultural Experiment Station, Tennessee Valley Authority · U.S. Govt. Print. Off.
102 sayfa · 1951
Soil surveys / Soils
Samuel Oscar Perkins, William Gettys, United States. Bureau of Plant Industry, Soils, and Agricultural Engineering, North Carolina Agricultural Research Service, Tennessee Valley Authority · The Bureau
85 sayfa · 1952
Soil surveys / Soils / Maps
Samuel Oscar Perkins, William Gettys, United States. Bureau of Plant Industry, Soils, and Agricultural Engineering, North Carolina Agricultural Experiment Station, Tennessee Valley Authority · U.S. Govt. Print. Off.
85 sayfa · 1952
Soil surveys / Maps
Samuel Oscar Perkins, E. F. Goldston, William Gettys, United States. Bureau of Plant Industry, North Carolina. Department of Agriculture, North Carolina Agricultural Research Service · For Sale by the Supt. of Docs.
52 sayfa · 1941
Soil surveys / Soils / Maps