Relief shown by hachures. Depths shown by soundings. "Published Oct. 1899 ... from data furnished by the United States Coast and Geodetic Survey H.S. Pritchard, Supt." Text on adjoining leaf: Match for the America's Cup commencing October 3rd, Shamrock-Columbia, 1899. Rules for match on verso signed: Regatta Committee. Originally issued as bifolium folded to 22 x 17 cm. Historic Maps copy has contemporary pencil notes.