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Geologic map of the Topton quadrangle, Lehigh and Berks counties, Pennsylvania
Topton quadrangle, Lehigh and Berks counties, Pennsylvania, geologic map
1 map : color ; 58 x 44 cm., on sheet 98 x 107 cm., folded in envelope 30 x 24 cm.
Department of the Interior, U.S. Geological Survey ; by Avery Ala Drake, Jr.
Relief shown by contours and spot heights.
Includes text, bibliography, 3 figures, and 2 col. cross sections, and location map.