Referaat "Suur Järvistu"
9) National Geographic/BBC. „How the Earth was made. Great Lakes“ (2008)
10) [WWW] http://geo.msu.edu/extra/geogmich/drumlins.html
11) [WWW]
http://www.maritimehistoryofthegreatlakes.ca/GreatLakes/Documents/HGL/figur
es.asp?ID=f156
12) United States Environmental Protection Agency, Government of Canada. The
Great Lakes. An environmental Atlas and Recourse Book. [WWW]
https://nepis.epa.gov/Exe/ZyPDF.cgi/P1004ICU.PDF?Dockey=P1004ICU.PDF
13) [WWW] http://www.great-lakes.net/tourism/circletour/
14) [WWW] https://www.epa.gov/greatlakes/lakewide-action-and-management-plans
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