Fire clays of Pennsylvania,
Shaw, Joseph Bradfield, 1884-
Fire clays of Pennsylvania, by J. B. Shaw. - [Harrisburg] Pennsylvania Topographic and Geologic Survey, 1928. - 69 p. illus., map. 23 cm. - Pennsylvania and Geological Survey. Bulletin M-10. . - Mineral resource report ; M10. .
"Pennsylvania and Geological Survey. 4th series."
Fire-clay.
Clay--Pennsylvania.
Fire clays of Pennsylvania, by J. B. Shaw. - [Harrisburg] Pennsylvania Topographic and Geologic Survey, 1928. - 69 p. illus., map. 23 cm. - Pennsylvania and Geological Survey. Bulletin M-10. . - Mineral resource report ; M10. .
"Pennsylvania and Geological Survey. 4th series."
Fire-clay.
Clay--Pennsylvania.