Book: The Sinister Signpost (Hardy Boys #15) - Grosset & Dunlap

Book: What Happened at Midnight? / The Sinister Signpost / The Clue in the Embers (Hardy Boys 10, 15 & 35; 3 Vols. in 1) - Grosset & Dunlap

Book: The Hardy Boys Mystery Stories The Sinister Signpost - Armada

Book: The Hardy Boys #15 Rthe Sinister Signpost - Grosset & Dunlap

Book: The Hardy Boys #13,14,15 (The Mark on the Door/The Hidden Harbor Mystery/The Sinister Signpost) - Grosset & Dunlap

Book: The Hardy Boys Box Set ; 15 Sinister Signpost, 16 Figure in Hiding, 17 Secret Warning, 18 Twisted Claw - Grosset & Dunlap

Book: The Hardy Boys 3 in 1 Sinister Signpost, Footprints Under the Window,Mystery ... - Franz Schneider Verlag, 1972.

Book: 10 Hardcover Hardy Boys mysteries: House on Cliff (#2), Secret of Old Mill (#3), Missing Chums (#4), Shore Road Mystery (#6), While Clock Ticked, Footprints Under Window, Mark on Door (#13), Hidden Harbor (#14), Sinister Signpost , Figure in Hiding - Grosset & Dunlap, New York

Book: Hardy Boys 9 Book Set Volumes 10-18: What Happened at Midnight/While the Clock Ticked/Footprints Under the Window/The Mark on the Door/The Hidden Harbor Mystery/The Sinister Signpost/A Figure in Hiding/The Secret Warning/The Twisted Claw - Grosset & Dunlap

Single Detail Page Misc: The Hardy Boys 11 Book Set Volumes 15-25: The Sinister Signpost/A Figure in Hiding/The Secret Warning/The Twisted Claw/The Disappearing Floor/Mystery of the Flying Express/The Clue of the Broken Blade/The Flickering Torch Mystery/The Melted Coins/The Short-Wave Mystery/The Secret Panel

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