Hardy Boys, The Masked Monkey Book
This is a 1976 printing of the Hardy Boys, book #51, The Masked Monkey. It lists to book #55 - The Witchmaster's Key. It has the black and white multi endpages. All 178 pages are intact with no markings or tears. There is some very minor corner wear. It is now in a mylar covering to prevent any future wear.
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Shipping: Negotiated with Seller