Groot Mere: Verskil tussen weergawes

! Gemiddelde diepte<ref name="Grady">{{cite book |last= Grady |first=Wayne |title= The Great Lakes|publisher= Greystone Books and David Suzuki Foundation| location=Vancouver |year= 2007 |isbn= 9781553651970 |unused_data= pgs. 42-43}}</ref>