The geology of Potter county
By: by Andrew Sherwood. Report on the coal fields by Franklin Platt ...
Contributors: Platt, Franklin, 1844-1900; Ashburner, Charles A. 1854-1889
Series: Pennsylvania. Geological Survey, 2d. Report of progress -- GGG; Report of progress (Geological Survey of Pennsylvania) -- G3.
Publisher: Pub. by the Board of Commissioners for the Second Geological Survey
Published: 1880
Place of publication: Harrisburg
Language: eng
Number of pages: 121
Subjects: Geology -- Pennsylvania -- Potter County.; Coal -- Pennsylvania.
Other titles: Report on the coal fields
Notes: At head of title: Second Geological Survey of Pennsylvania: Report of progress in 1876-79. GGG.

"Notes of a reconnoissance across the hills from Roulet to Sharon and back, made by Mr. Ashburner, and Mr. Carll, in 1877, for the purpose of comparing the conglomerates covering the hilltops in Potter and McKean, by Chas. A. Ashburner ": p. 97-GGG105.