1926. Geological Survey (U.S.). Relief shown by contours and spot heights ; contour interval on land 20 ft. ; contour interval on river surface 5 ft.; "Surveyed in 1925."; Vertica... The Survey (Washington).
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1925. Geological Survey (U.S.). Relief shown by contours and spot heights ; contour interval on land 20 ft. ; contour interval on river surface 5 ft.; Survey dates: 1921 and 1923.... The Survey (Washington).
1926. Geological Survey (U.S.). Relief shown by contours and spot heights.; "Surveyed in 1914 and 1924."; Topography also done by R.B. Kilgore.; Vertical scale of profiles 1 in. =... The Survey (Washington).