Map showing location of Panama Canal : as recommended by the Isthmian Canal Commission of 1899-1902 / supplement to the National Geographic Magazine.National Geographic Society (U.S.)1905In lower left margin: Andrew B. Graham Co., lithographers, Washington, D.C.In lower right margin: Oliver B. Harden del.Includes notes and profile of canal.Oriented with north toward upper left.Relief shown by contours and hachures. Depths shown by soundings.Supplement to National Geographic, October 1905.cartographic