1981 enduro roll chart -- can u help source it?

[marsattacks]

First, Mid-Ohio was amazing for second time I a row. Too too much to see and do. Got to meet Herr Clausen and learn lots of Penton info at Pentonville courtesy of Mr Danik. Great bikes. Thanks for lunch! Gary from Bowling Green thanks for the hospitality Fri night. Hope the Berkshire ran great.

I heard of and saw photos after the fact of a super nice Six Days (looked like an early toaster tanked bike) that went for 2k.

Now for a question:  I bought a roll chart and it is from April 26, 1981. 32 turns/waypoints and 55.8 miles. Does anyone have any idea how to figure out what race this was from w/o any info from seller?  Obviously it could be a local race but it is an interesting (but narrow) little glimpse into the past. Thanks John