Relief shown by contours and hachures. Depths shown by soundings.; Supplement to National Geographic, October 1905.; Oriented with north toward upper left.; In 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. 59 x 81 centimeters Scale 1:100,000 General Map Collection
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