Context

Context of Preliminary results of coring the Mesozoic diabase sheet near Reesers Summit, New Cumberland, Pennsylvania, by A.J. Froelich, with a section on magnetic susceptibility investigations by David L. Daniels, and a section on geophysical well logging of the core hole by Roger H. Morin ; prepared in cooperation with the Pennsylvania Bureau of Topographic and Geologic Survey, (microform)
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