Ubootshandbuch der Ostküste der Vereinigten Staaten von Nordamerika, Nördlicher Teil (Atlas).

Depths shown by contours and soundings. Phillips, 10508 "Geheim!" "Prüf = Nr. 93." "M. Dv. Nr. 860, 1, Atlas." Includes index map. Available also through the Library of Congress Web site as ...