Wilkins 375 instructions   http://www.youtube.com/watch?v=sMvM5xfr6Bs&feature=player_detailpage 

The Toro Company    http://www.toro.com/en-us/pages/default.aspx

Irritrol (A Toro Company)    http://irritrol.com/

Hunter Industries     http://www.hunterindustries.com/

The Irrigation Association     http://www.irrigation.org/

The Illinois Green Industry Association     http://www.illinoisgreen.net/