Robert Papp Books

Ghost of the Chattering Bones

By Robert Papp, Gertrude Chandler Warner

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Mystery Orphan Train

By Robert Papp, Gertrude Chandler Warner

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Seattle Puzzle

By Robert Papp, Gertrude Chandler Warner

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Secret of the Mask

By Robert Papp, Gertrude Chandler Warner

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The Amazing Mystery Show

By Gertrude Chandler Warner

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The Boxcar Children have been chosen to play in an exciting new game show! A camera crew is following the Aldens around the city of Philadelphia as they compete with another brother-and-sister team...

The Clue in the Recycling Bin

By Gertrude Chandler Warner

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The Aldens volunteer at the new recycling center in Greenfield.They find interesting objects that they take home and fix up. But after the Boxcar Children learn that the center has been vandalized,...

The Clue in the Recycling Bin

By Gertrude Chandler Warner

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The Great Turkey Heist

By Gertrude Chandler Warner

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The four Alden children, aged six to fourteen, uncover a mystery while volunteering at a food pantry for the needy.

Monkey Trouble

By Gertrude Chandler Warner

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It's spring, and all the baby animals are being born; a perfect time to visit the zoo. The Aldens and their friends are taking pictures there for a photo contest. But when cameras go missing and a...

Monkey Trouble

By Gertrude Chandler Warner

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It's spring, and all the baby animals are being born; a perfect time to visit the zoo. The Aldens and their friends are taking pictures there for a photo contest. But when cameras go missing and a...

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.