Scale 1:100,000
Relief shown by contours and hachures. Depths shown by soundings.
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.
"Supplement to the National Geographic magazine, Washington, D.C., October, 1905."
"Reprint."
Includes notes and profile of canal.