1944. Cartographic Details: Scale 1:250,000. approximately 1 in. to 4 miles ; Modified polyconic projection. Published in accordance with Act of Congress... The Survey (Washington D.C.).
1944. Gilpin, George. Relief shown by hachures.; Authorship attributed to George Gilpin in P.L. Phillips' A list of maps of America.; Reprint.; Annotated in pencil in lo... Mangum & Josephine Weeks (Alexandria).