@book{12479,
	author = {Sparwasser, W. A. and Bogard, Vinson A., and United States.},
	title = {Soil survey, Okmulgee County, Oklahoma},
	publisher = {U.S. Dept. of Agriculture, Soil Conservation Service; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.]},
	year = {1968.},
	address = {Washington]},
	note = {Cover title.}
}