Break the Chain: The USFL's Virtual 1st Down Measurements Are Working
NFL's first-down chains malfunctioned twice on road to Super Bowl
USFL to Use Chip in Ball for First Downs, Eliminate Chains – OutKick
Super Bowl LIV: How NFL Measures First Downs Is Primitively Low-Tech
How much do USFL players make? Breaking down the league's salary
USFL teams reveal their uniforms for the 2022 season - ESPN
Study: CFL teams should go for it more often on third down
USFL Archives - Awful Announcing
Football For A Buck: The Crazy Rise and Crazier Demise of the USFL
USFL to eliminate chains, measure first downs with chip in ball
First-down spots limit the necessity for too many measurements
Overlooked, Potter's winding path leads to GM of USFL's back-to
USFL reimagines football with new rules