Thomas R. Holtz Books

T. Rex: Hunter or Scavenger? (Jurassic World)
T. Rex: Hunter or Scavenger? (Jurassic World)

By Thomas R. Holtz

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Jurassic World is the long-awaited next installment of the groundbreaking Jurassic Park series. T. rex’s, velociraptors, triceratops—as well as some all-new dinosaurs—will roar across the screen in...

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Dinosaurs
Dinosaurs

By Thomas R. Holtz

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An award-winning encyclopedia written for young people but perfect for all ages, written to help everyone understand and appreciate the mind-blowing variety of dinosaurs—packed with museum-quality...

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A Little Giant Book
A Little Giant Book

By Thomas R. Holtz

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T. Rex
T. Rex

By Thomas R. Holtz

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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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