James Valentine Books

JUMPMAN RULE ONE

By James Valentine

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Jumpman Rule Two Jumpman Rule

By James Valentine

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Chez Vicalle Also

By James Valentine Blovian

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JumpMan Rule 1

By James Valentine

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When a defective time-jumping device strands Theodore, a teen from the distant future, in the twenty-first century, he is helped by two high schoolers--Jules, who is having time problems of his own...

Jumpman rule 2

By James Valentine

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Teenagers Genevieve Corrigan and Jules Santorini "TimeJump" to the year 15,000,000,072 to correct problems being caused by the not-so-trustworthy head of TimeMaster Corporation, Quincy Carter One.

The Future Is Unknown Timejumpers

By James Valentine

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Phanerozoic Diversity Patterns

By James Valentine

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The form guide

By James Valentine

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Weekends for Two in Northern California

By Bill Gleeson

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Researcher's guide to British film & television collections

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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.