The Secret of the Old Clock (1959)/The Hidden Staircase (1959) by Carolyn Keene (HC)
Content Description: Two Nancy Drew mysteries in one book, part of the Nancy Drew Mystery Series. Note: ISBN of second book is 0-448-09502-5
Condition Description: Good. Previous owner's name written on top of first title page of first story. No other markings or defects noted to text. Cover has very minor wear.
Publisher: Grosset & Dunlap
Number of Pages: 180; 182
Dimensions: 5" x 7 1/8" x 7/8"
Country of Manufacture: United States