1908. Geological Survey (U.S.). Relief shown by contours and spot heights on region map.; Battlefield map is intended to show the field as it was at or about the time of the battl... The Survey (Washington, D.C).
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1910. Geological Survey (U.S.). Relief shown by hachures.; Printed by A. Hoen & Co., Baltimore. 32 x 51 Centimeters Scale 1:62,500 General Map Collection. The Survey (Washington, D.C).
1910. Geological Survey (U.S.) and Wilson, A. D. (W 106⁰19ʹ--W 106⁰13ʹ/N 39⁰16ʹ--N 39⁰13ʹ). Relief shown by contours and spot heights. "Surveyed in 1879. Railroads and some shafts added later.... The Survey (Washington, D.C).
1916. Geological Survey (U.S.). Relief shown by contours, spot heights and bathymetric isolines.; Title in lower right corner: Portland and vicinity; at head of map: Topography.; ... The Survey (Washington, D.C).
1912. Cooke, Chas. E., Geological Survey (U.S.), Hawkins, Geo. T., Tufts, Wm. O., U.S. Coast and Geodetic Survey, Wilson, Herbert M. (Herbert Michael), 1860-1920, and Young, Gilbert. (W 90⁰30ʹ--W 90⁰00ʹ/N 38⁰45ʹ--N 38⁰30ʹ). Relief shown by contours and spot heights. Contour interval 20 feet. Datum is mean sea level. "Surve... The Survey (Washington, D.C).
1904. Cooke, Chas. E., Geological Survey (U.S.), Hawkins, Geo. T., Tufts, Wm. O., U.S. Coast and Geodetic Survey, Wilson, Herbert M. (Herbert Michael), 1860-1920, and Young, Gilbert. (W 90⁰25ʹ--W 90⁰05ʹ/N 38⁰44ʹ--N 38⁰31ʹ). Relief shwon by contours and spot heights. Text and ill. on verso. 39 x 47 centimeters Scale 1:62,500 ... The Survey (Washington, D.C).