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21781. Topographic sheets. West Virginia-Virginia-Kentucky, Oceana quadrangle, lat. 37° 30′-38°, long. 81° 30′-82°. Scale 1:125,000, contour interval 100 ft.

Corporate/Agency Authors:: Geological Survey
Publisher:: Geological Survey
Date:: Edition of Dec. 1898

21782. 18th annual report, 1897, Charles D. Walcott, director; pt. 3, economic geology. 1897 [1898].

Corporate/Agency Authors:: Geological Survey and Interior Department
Publisher:: Geological Survey
Date:: [November 1898]

21783. 19th annual report, 1898.

Corporate/Agency Authors:: Geological Survey and Interior Department
Publisher:: Geological Survey
Date:: [November 1898]

21784. Topographic sheets. California, Shasta sheet, lat. 41°-42°, long. 122°-123° Scale 1:250,000, contour interval 200 ft.

Corporate/Agency Authors:: Geological Survey and Interior Department
Publisher:: Geological Survey
Date:: Edition of Sept. 1894, reprinted Nov. 1898

21785. Topographic sheets. Colorado, Aspen special map. Scale 1:9,600, contour interval 25 ft.

Corporate/Agency Authors:: Geological Survey and Interior Department
Publisher:: Geological Survey
Date:: Edition of Jan. 1894, reprinted Nov. 1898

21786. Topographic sheets. Colorado, Castle Rock sheet, lat. 39°-39° 30′, long. 104° 30′-105°. Scale 1:125,000, contour interval 50 and 100 ft.

Corporate/Agency Authors:: Geological Survey and Interior Department
Publisher:: Geological Survey
Date:: Edition of Mar. 1894, reprinted Nov. 1898

21787. Topographic sheets. Colorado, Colorado Springs sheet, lat. 38° 30′-39°, long. 104° 30′-105°. Scale 1:125,000, contour interval 25, 50, and 100 ft.

Corporate/Agency Authors:: Geological Survey and Interior Department
Publisher:: Geological Survey
Date:: Edition of Aug. 1893, reprinted Nov. 1898

21788. Topographic sheets. Colorado, Higbee sheet, lat. 37° 30′-38°, long. 103°-103° 30′. Scale 1:125,000, contour interval 25 and 50 ft.

Corporate/Agency Authors:: Geological Survey and Interior Department
Publisher:: Geological Survey
Date:: Edition of Dec. 1893, reprinted Nov. 1898

21789. Topographic sheets. Colorado-Kansas, Vilas sheet, lat. 37°-37° 30′, long. 102°-102° 30′. Scale 1:125,000, contour interval 25 ft.

Corporate/Agency Authors:: Geological Survey and Interior Department
Publisher:: Geological Survey
Date:: Edition of June 1892, reprinted Nov. 1898

21790. Topographic sheets. Connecticut, Bridgeport sheet, lat. 41°-41° 15′, long. 73°-73° 15′. Scale 1:62,500, contour interval 20 ft.

Corporate/Agency Authors:: Geological Survey and Interior Department
Publisher:: Geological Survey
Date:: Edition of Apr. 1893, reprinted Nov. 1898

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