Gorham, E.Sanger, J.E.2013-06-182013-06-181976Gorham E, Sanger JE. Fossilized pigments as stratigraphic indicators of cultural eutrophication in Shagawa Lake, northeastern Minnesota. Geological Society of America Bulletin 1976;87(11):1638-1642.https://hdl.handle.net/11299/151363Fossil pigments in lake sediments as indicators of productivity, evolution, eutrophication and sources of organic matterArticle