David A. Adler Books

Cam Jansen and the Mystery of the Dinosaur Bones Cam Jansen Cam Jansen
Cam Jansen and the Mystery of the Television Dog Cam Jansen
Cam Jansen And the Mystery of the Babe Ruth Baseball
Cam Jansen And the Mystery of the Gold Coins
Cam Jansen and the Mystery of the Circus Clown Cam Jansen
Cam Jansen And the Mystery of the Monster Movie
Cam Jansen And the Mystery of the Monster Movie

By David A. Adler

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A fifth-grader uses her photographic memory, her mother, and her friend Eric to find a missing reel of a monster film they go to see.

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Cam Jansen And the Mystery at the Monkey House
Cam Jansen And the Mystery at the Monkey House

By David A. Adler

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Fifth-grade sleuth Cam Jansen uses her photographic memory to solve a monkey-smuggling mystery at the city zoo.

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Cam Jansen and the mystery of the stolen corn popper
Cam Jansen and the mystery of the stolen corn popper

By David A. Adler

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Fifth-grade sleuth Cam Jansen uses her photographic memory to catch a thief during a department store sale.

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Cam Jansen And the Mystery of Flight 54
Cam Jansen And the Mystery of Flight 54

By David A. Adler

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Fifth grade sleuth Cam Jansen and her friend Eric combine wits to solve the disappearance of a young French girl.

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Cam Jansen And the Triceratops Pops Mystery

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If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.

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