There were a lot of different tours during that era...
1970-1981 World Pro Skiing (WPS) , which Bob Beattie created. This was the one which Killy, Spider Sabich, Billy Kidd, Hank Kashiwa, Ken Corrock, the Palmer and Thompson Bros, etc were on....(ISRA- International Ski Racers Association)
1975-1982 The SierraTahoe Pro Race Circuit, (oldest of the "B" tours) (top French skiers were the big dogs on this tour- Yves Hottengendre sp?, Laurent Guffond, etc)
1977?-1980? The Coors Tour, (Greg "Bullrider" Snyder was one of the tour champs here, the Belden Bros, etc
1980?-1984? Then Puegeot came in and had an Eastern, Central and Western Tour (if I remember correctly, this was the era of the Halsnes Bros, Reidar Wahl, etc) By the end of this tour, it was a National tour, instead of regional
1984- 1995? Then the US Pro Tour (This was the Andre Arnold, Bernhard Knauss, Mahre era)
One of these later tours ended when a group of racers protested the conditions at a race in Mammoth, standing in the middle of the hill, and refusing to move.... The sponsors immediately disappeared, and the tour was over.