The Great Lakes Basin: ecoregions, drainage and urban areas.
[S.l.] :  Environment Canada, 
1987 [1988 reprint]
Insets: Waterborne commence; Winter temperatures and ice condition; Summer temperatures; Pollution sources and trophic status; Recreation and sports; Frost free period ...; Precipitation ...; Land use fisheries and erosion.
Maps sheet to accompany: The Great Lakes: an environmental atlas and resource book.