The Undercover Global League of Informants (UGLI) appears in book #46 (the Secret Agent on Flight 101)
The group UGLI was mentioned in the Hardy Boys book "The Flickering Torch Mystery" (Book #22) and "The Melted Coins" (Book #23).
There are 66 Hardy Boys books in all.
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The Secret Knowledge Of Organized Lawbreakers (SKoOL) appears in book #46 (the Secret Agent on Flight 101)
mysteries The Hardy Boys is actually a series of books - all about teen detectives, brothers Frank and Joe Hardy.
Henry Kurt is in book #33 (The Yellow Feather Mystery) in the Hardy Boys series
The second Hardy Boys mystery book is titled "The House on the Cliff."
Hardy Boys.
Fenton Hardy is gagged in the Hardy Boys books two times.
There are many people who write Hardy Boys books.Franklin W. Dixon is a ghost writer. Edward Stratemeyer created the Hardy Boys. or did he?????????????/
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The reading level of Hardy Boys books varies, but they are generally written at a 4th to 6th grade reading level.