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O'Connor, H.G., 1992, Geologic map, Douglas County: Kansas Geological Survey, Map M-26, scale 1:50,000, 33 x 31 inches.
Paper copies of the complete map (with stratigraphic column and legend info) can be purchased from the Kansas Geological Survey, 1930 Constant Ave., Lawrence, KS 66047 (or phone 785-864-3965) and at 4150 W. Monroe St., Wichita, KS 67209-2640 (phone 316-943-2343).
Howard G. O'Connor, 1960, Geology and Ground-water Resources of Douglas County, Kansas: Kansas Geological Survey, Volume 148, 200 p. [Available online]