49ers troubled turf gets first test Sunday against Cowboys at Levi's Stadium – The Mercury News
San Francisco 49ers cancel public Levi's Stadium practice due to poor grass conditions - ESPN
J.C Tretter: 'Only Natural Grass Can Level The NFL's Playing Field' - Sports Illustrated Cleveland Browns News, Analysis and More
49ers fullback Kyle Juszczyk runs on 'drive from within'
Titans to introduce new turf surface to Nissan Stadium
NFL players and owners are at odds over surfaces their teams play on
NFL field surface intel: Grass vs. turf, owners, problems - ESPN
Joe Burrow weighs in on NFL turf fields vs grass debate - Cincy Jungle
Field Turf Replacing Natural Grass
Kurtenbach: Kyle Shanahan is proving he's irreplaceable amid the 49ers' season from hell – Daily Democrat
Artificial turf's toll on NFL players can't compare with grass, Deebo Samuel says
Grant Cohn: Concussions and the dizzying array of misinformation