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U.S. Soccer Federation Referee Materials

http://www.ussoccer.com/referees
Following are direct links to official and authoritative U.S. Soccer Federtion Referee Program Materials posted on the U.S. Soccer website (www.ussoccer.com/referees):

Information for New Referees
Referee and Assistant Referee Procedures (Signals, Positioning, etc.)
Referee Continuing Education Videos
U.S. Soccer Federation Referee Program Points of Emphasis
IFAB Laws of the Game
U.S. Soccer Player Safety & Development Initiatives