THE CLUE OF THE BLACK KEYS: Nancy Drew Mystery Series, #28.
Edition: Later printing.
New York: Grosset & Dunlap, (1985, c 1968.). Hardcover - Cover by Rudy Nappi. Lists to #56 on back cover and on order form in rear of book. Illustrated with a plain frontispiece and 5 internal drawings. Format 19 with oval endpapers. 174 pp. plus 2 pp publisher's ads. ISBN: 0-448-095289.
Condition: Near fine in matte (flat) illustrated boards with a yellow spine.