"The Provincial Token Coinage of the 18th Century" by Messrs Dalton and Hamer is the one to get. There are various imprints, many of them US publications. They show a rarity scale, no values, but it's pretty comprehensive. Or, "The Silver Token Coinage" for the rarer silver tokens, this one is by Dalton on his own. Or for something more up to date (as a rarity scale....again, no values) have a look here: http://www.unsogno.net/conders/bibliography.htm Search that page for 'Sriro'. That's Dr G Sriro, who is very up on those tokens! I used to sell his CD's before he paniced after one got put on ebay and then he pulled the plug. I don't know if that 2006 info is still current, or even if he's still selling it.