The Pennsylvania geological survey; administrative report,

The Pennsylvania geological survey; administrative report, by Geo. H. Ashley. - Harrisburg, Pa., Dept. of internal affairs, Topographic and geologic survey, 1931. - 38 p. illus. (map.) 23 cm.

At head of title: Pennsylvania geological survey, fourth series.

gs 31000068

QE157 / .A315

557.48

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