Air Pollution and Health
United States Department of Labor: OSHA
https://www.osha.gov/silica-crystalline
Crystalline Silica Dust
http://sharonpreservationsociety.org/wp-content/uploads/2022/08/Crystalline-Silica-Dust-%E2%80%94-The-Invisible-Killer-12-06-2019.pdf
Utah Physicians for a Healthy Environment
https://www.uphe.org/air-pollution-health/
Dr. Mardelle Gamble on Silica Dust
https://youtu.be/XNzUa_fzDbA
https://www.countynewsonline.ca/emergency-doctor-pleads-for-safety-on-gravel-mining/#:~:text=An%20emergency%20room%20physician%20says,Mardelle%20Gamble.
Environmental
Gravel Deposits in Illinois
https://files.isgs.illinois.edu/sites/default/files/maps/statewide/imap10_front.pdf
State of Washington Department of Ecology: Recycled Concrete Aggregate Leachate
https://apps.ecology.wa.gov/publications/documents/2203003.pdf
EPA Ground Water Contamination
https://www.epa.gov/sites/default/files/2015-08/documents/mgwc-gwc1.pdf
Minnesota Department of Health Wellhead Protection Issues Related to Mining Activities
https://www.health.state.mn.us/communities/environment/water/docs/swp/mining.pdf
Gravel Watch Ontario: Aggregate Pits and Quarries: Adverse Effects and Negative Impacts on Human Health and the Environment
https://gravelwatch.org/legacy%20site/laws-gravel.pdf