I've bought a number of books from them over the years, and they're a reputable seller. Some of the rare Noffsinger stuff is photocopies, and he used his books a lot, so read descriptions carefully. Owner is retiring, and the shop is closing. Too bad; used bookstores are having a tough go of it recently.
You should have seen the Noffsinger collection when they first picked it up a number of years ago. There was stuff in there I still haven't seen again, and a fair number of items I can now see any time I want, in my library

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Dan