One archive I'd love to thumb through would be that of eBay seller Kyle's Cards. He produces a spectacular array of unique spring training shots including a couple tonight of Mike Heath (here's another one
http://m.ebay.com/itm/Mike-Heath-RAN...%257Ciid%253A8) that I've been looking for, for 35 years!
Heath was one of the keys in the Dave Righetti trade between the Yankees and Rangers after the 1978 season, but didn't make the Texas roster out of spring training and was dealt to Oakland in midseason.