Petrography of the Upper Freeport coal
Subtitle: Harmar and Springdale Mines, Allegheny and Westmoreland Counties, Pennsylvania.
Series: Pennsylvania. Bureau of Topographic and Geologic Survey. Bulletin M48; Bulletin M,; 48.
Published: 1963
Place of publication: Harrisburg
Language: eng
Number of pages: 43
Subjects: Coal -- Pennsylvania.
Notes: Bibliography: p. 33-34.
On cover: Mineral resources report.
At head of title: Pennsylvania Geological Survey, Fourth series.