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by Franklin W. DixonPaperback details (UK). details (USA). details (Germany). details (Canada). ISBN: 978-0-00-691050-3 ISBN-10: 0-00-691050-5 HarperCollins,Australia · 1975 |
| See also: | ||
| 2004 | Hardcover | The Sinister Signpost (Hardy Boys, Book 15) |
| 1989 | Paperback | The Sinister Signpost (Armada Classics) |
| 1982 | Paperback | Sinister Signpost (Hardy Boys Mystery Stories) |
| 1972 | Hardcover | Sinister Signpost (Hardy boys mystery stories/Franklin W Dixon) |
| 1936 | Hardcover | The Sinister Signpost (Hardy Boys #15) |