The Secret of the Caves
Franklin W. Dixon
Hardy Boys Original (7)
Reboots
Mercedes Lackey & Cody Martin
The Stellar Guild (1)
Foundation
Isaac Asimov
Foundation (3)
Donavan
Diana Palmer
Long Tall Texans (10)
Tower Treasure
Hardy Boys Original (1)
Three-Ring Terror
Hardy Boys Original (111)
The Wailing Siren Mystery
Hardy Boys Original (30)
The Viking Symbol Mystery
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The Secret Warning
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The Great Airport Mystery
Hardy Boys Original (9)