Lee Christiansen Books

On This Spot: An Expedition Back Through Time

By Susan E. Goodman, Lee Christiansen

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The changing image of one geographic area in New York City is traced from the present back to millions of years ago.

Turtle Turtle Watch Out

By April Pulley Sayre, Lee Christiansen

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Eagle Boy

By Richard Lee Vaughan, Lee Christiansen

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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.