Thomas R. Holtz Books

Jurassic Park Institute (TM) Dinosaur Field Guide

By Michael Dr Brett-Surman, Thomas R. Holtz, Dr. Thomas R. Holtz Jr., Dr. Michael Brett-Surman, Holtz Jr., Dr. Thomas R., Brett-Surman, Dr. Michael

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The Jurassic Park Institute is an absolutely accurate way for kids to get excited about dinosaur science! Written by two noted paleontologists and illustrated in big bold colors, this kid-friendly...

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...

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...

T.Rex Hunter or Scavenger

By Thomas R. Holtz

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T. Rex Hunter or Scavenger Step Into Reading A Step 5 Book

By Thomas R. Holtz

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T. Rex Hunter or Scavenger Jurassic Park Institute

By Thomas R. Holtz

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The Little Giant Book of Dinosaurs

By Thomas R. Holtz

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The gigantic book of dinosaur fun

By Thomas R. Holtz

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A Little Giant Book

By Thomas R. Holtz

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T. Rex

By Thomas R. Holtz

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How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

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.