Ground characteristics map. Covers Manhattan, Roosevelt Island, Ward's Island and Randalls Island, New York (N.Y.). Shows streams, ponds and wetlands, reservoirs and landfill. Also shows location of piers, streets, aqueduct and sewers. Shows relief by hachures and gradient tints on main map, by cross-sectional map profile on ancillary maps. Date of situation 1864. "Entered according to Act of Congress in the year 1865 ..." "Prepared for the Council of Hygiene and Public Health" on pasted label. Includes color key. Includes three ancillary map profiles: "Section across Central Park, Section from 50th Street to Brooklyn Heights, Section from Hoboken to Brooklyn."