Philippine Islands : harbors of Batan and Babuyan Islands and Northern Luzon / published ... by the Coast and Geodetic Survey, O.H. Tittmann, Superint…
U.S. Coast and Geodetic SurveyView Full Item in University of Wisconsin-MilwaukeeRelief shown by spot heights and hachures. Depths shown by gradient tints, soundings, and isolines ; Includes text, tables, and 3 inset maps ; ""No. 4270"" -- upper left margin ; ""Soundings in fathom…