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Structure Map of the Wissahickon Schist at Philadelphia
Index Map For Specimens of Wissahickon Schist of Philadelphia
The Wissahickon Schist At Philadelphia Showing Areal Geology, Metamorphic Zones and Numbered Localities
Structural Petrology of the Wissahickon Schist Near Philadelphia, Pennsylvania
Depth and Yield of Rock Wells in north-central Philadelphia
Structure Map of the Wissahickon Schist at Philadelphia