Soil survey manual,
by Soil Survey Staff.

APA Citation

United States. Bureau of Plant Industry, S., United States. Soil Conservation Service. (1951). Soil survey manual. Washington: For sale by the Supt. of Docs., U. S. Govt. Print. Off..

MLA Citation

United States. Bureau of Plant Industry, Soils, and Agricultural Engineering, and United States. Soil Conservation Service. Soil Survey Manual. Washington: For sale by the Supt. of Docs., U. S. Govt. Print. Off., 1951.

Warning: These citations may not always be complete (especially for serials).