MLB umpires just in Orioles spring training game proved not needed
MLB umpire Vanover still in hospital after hit in head by throw
MLB umpires to announce replay review decisions to fans - ESPN
Replay taking hostility out of manager-umpire relationship
Play Ball! UConn Magazine
Umpires might get microphones to explain video reviews, and
Baseball needs replay
Major League Baseball approves expanded instant replay, managers
67-Year-Old Umpire Hospitalized After Being Hit in Head
Angel Hernandez now interim umpire crew chief after opt outs