Gertrude Chandler Warner Books

The Disappearing Staircase Mystery

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When the Alden children join a group of volunteers to fix up an old house for senior citizens, they try to explain the puzzling behavior of their coworkers as well as investigate some unusual events.

The Mystery on Blizzard Mountain

By Gertrude Chandler Warner

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When the Alden children go camping on Blizzard Mountain, a place said to be inhabited by a ghost looking for buried treasure, they begin to think someone or something is trying to scare them off.

The Comic Book Mystery

By Gertrude Chandler Warner

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The Mystery at Skeleton Point

By Gertrude Chandler Warner

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Henry, Jessie, Violet, and Benny used to live alone in a boxcar. Now they have a home with their grandfather, and they're exploring a haunted house!

The Ice Cream Mystery

By Gertrude Chandler Warner

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The Radio Mystery The Boxcar Children Mysteries 97

By Gertrude Chandler Warner

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The mystery of the haunted boxcar

By Gertrude Chandler Warner

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The Boxcar Children The Black Widow Spider Mystery Special 21

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Life Minor Collisions

By Gertrude Chandler Warner

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Life Minor Collisions

By Gertrude Chandler Warner

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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.