Marquette County Snowmobile Association started in 1968. Over 50 years of history and still going! Even though machines, trail routes, signs(to name a few) have changed, the goal has always been the same; provide safe and fun snowmobile trails across the county.
Jim Johnson has collected various newspaper clippings that date all the way back to 1968.
Here is the list of them:

Original Marquette County Action Plan Original Action Plan

1968-69 Snowmobile Trails are laid out. Racing in Oxford

1968-71    Montello Yetis gets name. Harrisville races. are laid out.

1968-71  Endeavor Starts - '71 meeting notes

1973-75 - First Map - Montello adopts Ordinances

1971 - Endeavor early bridge work

1971 - Endeavor Ordinances - 1971 meeting notes

1973 - New state regulations, Endeavor meeting and events, 1973 meeting notes.

1973-74 working with WI DOT to provide safe crossing over 51. 1973 State Senate Bill

1975-76 Fees, Meeting Notes, Poker Run dates

1976 Map & County club history

1980's Notes from Westfield