Soil survey, Mercer County Pennsylvania /

by Grice, Darrell Gene, 1930-, Grubb, Robert G., Jaquish, Orin Willis, 1924-
[Washington] : Soil Conservation Service : for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1971

Soil survey of Venango County, Pennsylvania /

by Churchill, Norman J.
[Washington] : [U.S. Govt. Print. Off.], 1975

Soil survey of Lebanon County, Pennsylvania.

by Holzer, Donald B.
[Washington, D.C.?] : U.S. Dept. of Agriculture, Soil Conservation Service, 1981

Soil survey of Lackawanna and Wyoming Counties, Pennsylvania.

by Eckenrode, Joseph J.
[Washington, D.C.?] : U.S. Dept. of Agriculture, Soil Conservation Service, 1982

Soil survey of Union County, Pennsylvania /

by Eckenrode, Joseph J.
[Washington, D.C.?] : The Service, 1985

Soil survey of Lancaster County, Pennsylvania /

by Custer, Boyd H.
[Washington, D.C.?] : The Service, 1985