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1
Geology and mineral resources of the Quakertown-Doylestown ..
United States congressional serial set ; serial set no. 9407;House document / 71st Congress, 3rd session. House ; no. 613
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2
Shorter contributions to general geology, 1927. W.C. Menden..
United States congressional serial set ; serial set no. 8768;House document / 69th Congress, 2nd session. House ; no. 485
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3
Shorter contributions to general geology, 1923-1924, [by] W..
United States congressional serial set ; serial set no. 8308;House document / 68th Congress, 1st session. House ; no. 74
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4
Water resources of the Philadelphia District, by Florence B..
United States congressional serial set ; serial set no. 4724;House document / 58th Congress, 2nd session. House ; no. 760
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5
Ancient volcanic rocks of South Mountain, Pennsylvania, by ..
United States congressional serial set ; serial set no. 3446;House document / 54th Congress, 1st session. House ; no. 421