Geologic map of the Slate Run quadrangle, Pennsylvania /

by Colton, George Willis, 1920-
[Harrisburg, Pa.] : Pennsylvania, Bureau of Topographic and Geologic Survey, 1966

Bedrock geology of the Waterville Quadrangle, Lycoming County, Pennsylvania /

by Colton, George Willis, 1920-
Harrisburg : Commonwealth of Pennsylvania, Dept. of Internal Affairs, Bureau of Topographic and Geologic Survey, 1968

Bedrock geology and surface structure of the Cedar Run quadrangle, Tioga and Lycoming Counties, Pennsylvania /

[Harrisburg] : [publisher not identified], 1963

Bedrock geology of the Waterville Quadrangle, Lycoming County, Pennsylvania /

by Colton, George Willis, 1920-
[Harrisburg, Pa.] : Phila., Pa. : Pennsylvania, Bureau of Topographic and Geological Survey ; Alvah Bushnell Co., 1968

Bedrock geology of the Cedar Run quadrangle, Tioga and Lycoming Counties, Pennsylvania /

by Colton, George Willis, 1920-
[Harrisburg, Pa.] : [Commonwealth of Pennsylvania, Department of Internal Affairs, Bureau of Topographic and Geological Survey], 1963

Bedrock geology of the Slate Run quadrangle, Clinton, Lycoming, and Potter Counties, Pennsylvania /

by Colton, George Willis, 1920-
[Harrisburg, Pa.] : [Philadelphia, Pa.] : [Commonwealth of Pennsylvania, Dept. of Internal Affairs, Bureau of Topographic and Geological Survey] ; [Alvah Bushnell], 1965

Bedrock geology and surface structure of the Cedar Run quadrangle, Tioga and Lycoming Counties, Pennsylvania,

by Colton, George Willis, 1920-
[Harrisburg] 1963

Bedrock geology of the Waterville Quadrangle, Lycoming County, Pennsylvania /

by Colton, George Willis, 1920-
Harrisburg : Pennsylvania Topographic and Geologic Survey, 1968