- Michigan Township Association
https://www.michigantownships.org/sandandgravel.asp
- Sierra Club, Michigan Chapter
http://sharonpreservationsociety.org/wp-content/uploads/2022/02/SB-429-431-Committee-Letter.pdf
- Michigan League of Conservation Voters
https://secure.everyaction.com/J38sK1m0tESPvX7DkwNjxg2 (letter to legislators)
- Detroit News
- Fractracker Alliance
Permitting Aggregate Mines under Michigan’s Zoning Enabling Act – FracTracker Alliance
Permitting Aggregate Mines in Michigan Poses Very Serious Consequences