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1
Pre-Cambrian geology of the Boyertown Quadrangle /
by Buckwalter, Tracy V. (Tracy Vere), 1918-
[Harrisburg, Pa.] : [Pennsylvania Bureau of Topographic and Geologic Survey], 1959

Government Document Book
2
Interpretation of K-Ar and Rb-Sr isotopic dates from a Precambrian basement core, Erie County, Pennsylvania /
by Lapham, Davis M.
Harrisburg [Pa.] : Pennsylvania Bureau of Topographic and Geologic Survey, 1975

Government Document Book
3
The Precambrian geology of the Reading 15' quadrangle /
by Buckwalter, Tracy V. (Tracy Vere), 1918-
[Harrisburg, Pa.] : Pennsylvania, Bureau of Topographic and Geological Survey, 1962

Government Document Book
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