Gertrude Chandler Warner Books

Houseboat Mystery

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Four brave siblings were searching for a home – and found a life of adventure! Join the Boxcar Children as they investigate a mystery while vacationing on a houseboat in this illustrated chap...

Snowbound Mystery

By Gertrude Chandler Warner

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Four brave siblings were searching for a home – and found a life of adventure! Join the Boxcar Children as they investigate the mystery of their snowbound cabin in this illustrated chapter bo...

Tree House Mystery

By Gertrude Chandler Warner

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Four brave siblings were searching for a home – and found a life of adventure! Join the Boxcar Children as they investigate the mystery of a secret window in this illustrated chapter book ser...

Bicycle Mystery

By Gertrude Chandler Warner

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Four brave siblings were searching for a home – and found a life of adventure! Join the Boxcar Children as they investigate the mystery of an abandoned farmhouse in this illustrated chapter b...

Mystery in the Sand

By Gertrude Chandler Warner

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Four brave siblings were searching for a home – and found a life of adventure! Join the Boxcar Children as they investigate the mystery of an old gold locket in this illustrated chapter book...

Mystery Behind the Wall

By Gertrude Chandler Warner

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Four brave siblings were searching for a home – and found a life of adventure! Join the Boxcar Children as they investigate the mystery behind the wall in this illustrated chapter book series...

Bus Station Mystery

By Gertrude Chandler Warner

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Four brave siblings were searching for a home – and found a life of adventure! Join the Boxcar Children as they investigate some suspicious activity at a bus station in this illustrated chapt...

Benny Uncovers a Mystery

By Gertrude Chandler Warner

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When Benny and Henry get summer jobs at a department store in town, they don't expect to be solving mysteries at work. But when an expensive vase disappears, the salespeople receive strange notes,...

The Pumpkin Head Mystery

By Gertrude Chandler Warner

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The Alden children were searching for a home – and found a life of adventure! Beloved by generations of families, this illustrated chapter book series is full of wholesome excitement, danger,...

The Great Turkey Heist

By Gertrude Chandler Warner

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The Alden children were searching for a home – and found a life of adventure! Beloved by generations of families, this illustrated chapter book series is full of wholesome excitement, danger,...

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.