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Robert AI don't have a link to "The Monster." It was written by Bill Heitman quite a while ago. Some serious t206 collectors might say it's a little outdated, but it is A MUST for serious t206 collectors either way...even if you are going to make your own list, it's just a cool checklist that Heitman uses.
Unfortunately, it might not be easy to find. I bought mine on ebay. It is a very short study that looks like a pamphlet.