Soil survey of Calvert County, Maryland /
by S.O. Perkins and Merl F. Hershberger.

APA Citation

Hershberger, M. F., Perkins, S. O. (Samuel Oscar)., Maryland Geological Survey., Maryland Agricultural Experiment Station., United States. Bureau of Chemistry and Soils. (1931). Soil survey of Calvert County, Maryland. Washington, D.C.: U.S. G.P.O..

MLA Citation

United States. Bureau of Chemistry and Soils, et al.. Soil Survey of Calvert County, Maryland. Washington, D.C.: U.S. G.P.O., 1931.

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