Nancy Drew, The Clue of the Black Keys Book
This is a revised edition of book #28, The Clue of the Black Keys, in the series of 56 yellow spine books. It lists to #51- Mystery of the Glowing Eye, 1974. It has 20 chapters and all 174 pages are intact with no markings or tears. There is some light fading of the spine and the back cover. This book is now in a Mylar covering to prevent any future wear.
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