Ruth Christoffer Carlsen Books

While feeling that everything bad is blamed on him and everything good ends quickly, an eleven-year-old boy also begins to realize the reasons for the ups and downs in his life.

Half-past tomorrow.

By Ruth Christoffer Carlsen

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After an injury to his head, a junior-high boy discovers he has the frustrating, frightening, and dangerous ability to read tomorrow's newspaper.

Mr. Pudgins

By Ruth Christoffer Carlsen

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Henrietta goes West

By Ruth Christoffer Carlsen

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Mr. Pudgins

By Nancy Pearl, Ruth Christoffer Carlsen, Margaret Bradfield

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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.