Hard to say, but the name seems to have been changed (or split) into two entities:  Horseshoe Casino, and Bluffs Run Dog Track and/or RV Park.  Greyhound racing?  Whatever, the postmark is not clear on when this was mailed, but it was at the time of 32-cent stamps.  Upper edge of the card is perforated, so it had been part of a sheet or set.  Grade: 2