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Geologic map of anthracite-bearing rocks in the north part of the Orwigsburg quadrangle, Schuylkill County, Pennsylvania
1 map : color ; on sheet 99 x 91 cm., folded in envelope 30 x 24 cm.
by Gordon H. Wood, Jr. ; Department of the Interior, United States Geological Survey.
Relief shown by contours and spot heights.
Includes 7 col. cross sections, location map, 3 charts, and stratigraphic column.
Miscellaneous geologic investigations ; map I-689