Lot of four early printing 5x7.5" hardcovers w/original illustrated dustjackets published by Grossett & Dunlap. All are marked as written by Carolyn Keene, a collective pseudonym for a number of authors who served as ghostwriters for the series. Titles/original publication dates are as follows - "The Clue in The Diary" (1932), "Nancy's Mysterious Letter" (1932), "The Password To Larkspur Lane" (1933), "The Haunted Bridge" (1937). DJs are unclipped, though first title has 2x2.25" piece missing from top left back corner. Good/VG. Rest of DJs have scattered wear/dust soiling and are Fine-VF overall. Books themselves shows lt. wear and second title has inked inscription inside front cover. VF overall.