Report of progress in Armstrong county
By: by W. G. Platt.
Series: Pennsylvania. Geological survey, 2d. / [Report of progress -- H5]; Report of progress (Geological Survey of Pennsylvania) -- H5.
Publisher: Published by the Board of commissioners for the Second geological survey
Published: 1880
Place of publication: Harrisburg
Language: eng
Number of pages: 338
Subjects: Geology -- Pennsylvania -- Armstrong County.; Coal -- Pennsylvania.
Notes: At head of title : Second geological survey of Pennsylvania : 1879.