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Hardy Boys APC Library Editions |
| These library editions were bound from the late 1950s until the early 1970s by the American Publishers Corporation. Most of the books are blue while some scattered examples are red. | |||||
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 1. The Tower Treasure |
 3. The Secret of the Old Mill |
 4. The Missing Chums |
 6. The Shore Road Mystery |
 7. The Secret of the Caves |
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 9. The Great Airport Mystery |
 10. What Happened at Midnight |
 10. What Happened at Midnight |
 11. While the Clock Ticked |
 12. Footprints Under the Window |
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 13. The Mark on the Door |
 14. The Hidden Harbor Mystery |
 15. The Sinister Signpost |
 16. A Figure in Hiding |
 17. The Secret Warning |
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 18. The Twisted Claw |
 19. The Disappearing Floor |
 20. The Mystery of the Flying Express |
 21. The Clue of the Broken Blade |
 23. The Melted Coins |
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 23. The Melted Coins |
 24. The Short-Wave Mystery |
 25. The Secret Panel |
 26. The Phantom Freighter |
 27. The Secret of Skull Mountain |
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 27. The Secret of Skull Mountain |
 28. The Sign of the Crooked Arrow |
 28. The Sign of the Crooked Arrow |
 28. The Sign of the Crooked Arrow |
 29. The Secret of the Lost Tunnel |
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 31. The Secret of Wildcat Swamp |
 32. The Crisscross Shadow |
 33. The Yellow Feather Mystery |
 34. The Hooded Hawk Mystery |
 34. The Hooded Hawk Mystery |
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 36. The Secret of Pirates' Hill |
 36. The Secret of Pirates' Hill |
 37. The Ghost of Skeleton Rock |
 38. The Mystery at Devil's Paw |
 39. The Mystery of the Chinese Junk |
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 40. The Mystery of the Desert Giant |
 41. The Clue of the Screeching Owl |
 43. The Mystery of the Aztec Warrior |
 46. The Secret Agent on Flight 101 |
 47. The Mystery of the Whale Tattoo |
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 47. The Mystery of the Whale Tattoo |
 49. The Bombay Boomerang |
 51. The Masked Monkey |
52. The Shattered Helmet |
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