I had forgotten about that, and I was there that day! We bought a number of covers and stamp combinations that day, mostly because my dad is big into the horses, rather than the stamps. Actually, there is another 1st day cover from Cedar Point, which is actually postmarked from the Cedar Point substation. I can't remember the event, or when it happened, but it was something like 40 years ago or more.
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Timothy A. Bretz
"Remember to pillage before you burn"
http://ourworld.compuserve.com/homepages/tabretz