Text has title: Total alkalinity of surface waters: a map of the Upper Midwest Region.
Base map: Department of Geography, Cartographic Service, Oregon State University.
"Map and text"--Envelope.
Shipping list no.: 86-163-P.
"June 1985"--Text.
Includes "Locations of lakes and stream sites from which alkalinity data were obtained" map, and mean annual total alkalinity diagram.
"EPA-600/D-85-043"--Text.