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Letter from Henry Waln Drinker to Thomas Pim Cope, 1823 August 11
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
Germantown 15 Minute Quadrangle, Research Map
Philadelphia 15 Minute Sheet
Philadelphia 15 Minute Sheet, Research Map Historical Geology Sheet
Germantown Sheet, Sample Location Map
Philadelphia 15 Minute Sheet, Research Map
Depth and Yield of Rock Wells in north-central Philadelphia
Research Map. Crushed Rocks. Philadelphia.
Staurolite-Kyanite Subfacies. Philadelphia.
Research Map. Crushed Rocks. Mylonites. Cataclastic rocks. Philadelphia.
Granitized Mica Schists. Philadelphia.
Research Map. Isograds. Philadelphia.
Research Map. Crushed Rocks. Mylonites. Cataclastic rocks. Philadelphia.
Chloritized Mica Schists. Philadelphia.
Research Map. Chloritized Rocks. White Chlorite. Tourmaline. Philadelphia.

Pages