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2
by Stone, Ralph W. (Ralph Walter), 1876-1964
Harrisburg : [Pennsylvania Topographic and Geologic Survey], 1967
Revised.
“...Pennsylvania Geological Survey. Bulletin G 2....”Harrisburg : [Pennsylvania Topographic and Geologic Survey], 1967
Revised.
Book
3
by Stone, Ralph W. (Ralph Walter), 1876-1964, Starr, Eileen M.
Harrisburg : [May be purchased from Capitol Book Store], 1967
Revised.
“...Pennsylvania Geological Survey, 4th ser. Bulletin G 2...”Harrisburg : [May be purchased from Capitol Book Store], 1967
Revised.
Book
4
by Stone, Ralph W. (Ralph Walter), 1876-1964
Harrisburg : Department of Internal Affairs, Topographic and Geologic Survey, 1932
“...Pennsylvania. Geological survey, (4th, 1919- ) Bulletin G2...”Harrisburg : Department of Internal Affairs, Topographic and Geologic Survey, 1932
Book