[Greenmonster]

Hi Lance....The reference is the Baseball Stadium Postcard Checklist and Price Guide, collaborative effort between myself and 10 other Stadium Postcard collectors, it was privately published by Tom Crabtree in 1997. It took us a couple of years to put together, using our collections and snail mailing lists back and forth to each other. It's never been maintained but does checklist over 6700 cards including variations. Neither Tom or I have any copies left, once and awhile one will show up on eBay. Thanks. Jim