Carolyn Keene Books

The Nancy Drew sleuth book

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In solving a series of mysteries, Nancy Drew and her Detective Club study techniques of criminal investigation involving handwriting, fingerprints, codes, and moulages.

Nancy Drew 02

By Carolyn Keene

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The bungalow mystery

By Carolyn Keene, Michael J. Bugeja

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A terrified young girl and the peculiar guardian she fears get Nancy involved in a strange and daring mystery case.

Nancy Drew 04

By Carolyn Keene

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Nancy Drew 05

By Carolyn Keene

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Nancy Drew 06

By Carolyn Keene

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Nancy Drew 08

By Carolyn Keene

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Nancy Drew 09

By Carolyn Keene

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Password to Larkspur Lane Nancy Drew Mystery Stories Number 10

By Carolyn Keene

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Nancy Drew 11

By Carolyn Keene

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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.