Carolyn Keene Books

Nancy Drew 53: the Sky Phantom

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Nancy goes to Excello Flying School in the Midwest to take lessons, while her friends Bess and George perfect their horseback riding. But soon the young sleuth is confronted with the mystery of a h...

Nancy Drew 54: The Strange Message in the Parchment

By Carolyn Keene

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A sheep farmer receives a mysterious telephone call shortly after he buys a series of pictures painted on parchment. “Decipher the message in the parchment and right a great wrong,” the voice says....

Nancy Drew 55: Mystery of Crocodile Island

By Carolyn Keene

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In a response to a friend’s call for help, Nancy’s father, a lawyer, asks her to travel to mysterious Crocodile Island with her friends Bes and George to study the reptiles and try to uncover a gro...

Nancy Drew 56: the Thirteenth Pearl

By Michael J. Bugeja

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Nancy is asked to locate a stolen pearl necklace that is unusual and very valuable. She soon learns that strange and dangerous people are responsible for the theft. They harass her at home and inte...

Nancy Drew Mystery Stories

By Michael J. Bugeja

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Together in this one book are the two original Nancy Drew's mysteries, which began the classic series of the girl detective!Nancy Drew investigates two cases sending her on dangerous adventures. In...

Nancy Drew Sleuth Book

By Michael J. Bugeja

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Mystery of the Lost Dogs

By Michael J. Bugeja

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When several dogs, including her own, are suddenly missing, Nancy suspects the existence of a dognapping ring in the community.

Nancy Drew 00

By Carolyn Keene

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Mystery of the Lost Dogs

By Michael J. Bugeja

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When several dogs, including her own, are suddenly missing, Nancy suspects the existence of a dognapping ring in the community.

The secret of the twin puppets

By Michael J. Bugeja

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Two little girls ask Nancy to solve the mystery of two oddly behaving puppets.

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.