Robert Papp Books

The Spy Game

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When the Boxcar Children visit a neighbor’s house, a mysterious old wedding photo and a riddle lead them on a “spy game” devised long ago by the original owner of the house. When the children hunt...

The Spy in the Bleachers

By Gertrude Chandler Warner

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It's a big week at Cogwheel Stadium—the baseball team the Clayton Cogs are playing for the pennant! The Aldens are helping out at the ballpark, and they're glad to be part of the excitement. But th...

The Spy in the Bleachers

By Gertrude Chandler Warner

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The Zombie Project

By Gertrude Chandler Warner

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While at the Winding River Lodge, the Aldens hear about a zombie living in the surrounding forest! As the signs of zombie attacks start to mount, the Boxcar Children recruit the help of a reporter...

Scarlet Stockings Spy

By Trinka Hakes Noble, Robert Papp

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Last Brother

By Trinka Hakes Noble, Robert Papp

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Lanie American Girl Girl of the Year 2010 Book 1

By Jane Kurtz, Robert Papp

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Lanie s Real Adventures American Girl Girl of the Year 2010 Book 2

By Jane Kurtz, Robert Papp

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Last Brother

By Trinka Hakes Noble, Robert Papp

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Scarlet Stockings Spy

By Trinka Hakes Noble, Robert Papp

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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.