1901. Geological Survey (U.S.). Contour interval 5 feet.;"Surveyed in 1889, 1897 and 1899.";Relief indicated by contours.;1 map, colored;45 x 34 cm.;1:62,500. Geological Survey (U.S.).
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1901. Geological Survey (U.S.). Contour interval 10 feet;"Surveyed in 1889, 1897 and 1899.";Relief shown by contours.;1 map, colored;45 x 34 cm.;1:62,500. Geological Survey (U.S.).