maps : col. ; 97 x 119 cm. or smaller. Scales differ ; Polyconic proj., Lambert conformal proj. and universal transverse Mercator proj. Shows the Great Lakes plus adjacent waterways such as Lake of the Woods, Lake Champlain, New York State Barge Canal System, etc. Shows detailed information suitable for lake, channel, and river navigation including hydrography of water areas, topography of adjacent land areas, and landmarks visible from lakes and channels. Relief shown by contours. Depths shown by soundings and contours. Relief shown by hachures on some sheets. Early editions have title: Survey of the northern and northwestern lakes. Current issues are published by the Lake Survey Center. Some sheets published by U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, National Ocean Survey. Some sheets published by Canadian Hydrographic Service, Marine Sciences Branch, Department of Mines and Technical Surveys, Ottawa. "War Department. Corps of Engineers"--Some earlier sheets. Includes various issues of some sheets. Most sheets are polyconic proj., however Mercator, Lambert conformal and universal transverse Mercator projections are used on some sheets. Some sheets include text, "Fathoms and Feet to Meters" conversion table, and average water level tables.