- Wisconsin Trust for Historic Preservation
- The Area Research Center at Murphy Library at the University of Wisconsin-La Crosse. Special thanks to Teri Talpe at the Area Research Center for her assistance in helping me locate additional photos of the Oehler Mill, dam, and family.
- Shunpiking To Heaven. This wonderful website features beautiful photography by Joann M. Ringelstetter. Her website features photos of many rural scenes throughout the midwest, including mills, barns, outhouses, landscapes, animals, flowers, theaters, and much more.