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I am looking for the following titles in the Hardy Boys series published by Grosset & Dunlap in the 1960s and 1970s. These are the matte blue bindings with the art printed directly onto the front cover. They have oval pictures of the boys on the spine.
If you have these titles in this edition, please PM me.
45. The Mystery of the Spiral Bridge 46. The Secret Agent on Flight 101 47. Mystery of the Whale Tattoo 48. The Arctic Patrol Mystery 49. The Bombay Boomerang 50. Danger on Vampire Trail 51. The Masked Monkey 53. The Clue of the Hissing Serpent 54. The Mysterious Caravan 55. The Witchmaster's Key 57. The Firebird Rocket 58. The Sting of the Scorpion