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So for this set of books it is edition 1 and 2, book 1 is used and is noted as the pictures show when I went to school which I think is kind of neat just noting some important studies of hvac fundamentals if you will. I am also including edition number 2 with it and that is brand new opened only a few times. Book 1 is used and has a used spine but still fully intact readable useable and book 2 is in almost perfect condition no notations no highlights just a great conditioned book. Both are as I state these are the books you will have to purchase in trade or in a college setting for probably far more then from me. If you have any questions at all please ask. Thank you and happy bidding
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