1. Drift Thickness Map, Lower Peninsula of Michigan: Michigan Geological Survey Division, Map No. 3528, scale 1:500,000;Akers,1938
2. Drainage beneath ice sheets: groundwater–channel coupling, and the origin of esker systems from former ice sheets;Boulton;Quaternary Science Reviews,2009
3. Tunnel channels and associated landforms, south-central Ontario: their implications for ice-sheet hydrology;Brennand;Canadian Journal of Earth Sciences,1994
4. Ice-marginal terrestrial landsystems: southern laurentide ice sheet margin;Colgan,2005
5. Tunnel channels formed in Wisconsin during the last glaciations;Clayton,1999