David A. Kelly Books

Ballpark Mysteries 6: The Wrigley Riddle

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Next up to the plate—book #6 in our early chapter book mystery series, where each book is set in a different American ballpark! Ivy-covered walls—they're the most famous part of the Chicago Cubs' h...

The Wrigley riddle

By David A. Kelly

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During a visit to the Chicago Cubs' Wrigley field, cousins Mike and Kate investigate why someone has been tampering with the famous ivy vines growing on the outfield walls. Includes historical note.

Ballpark Mysteries 6: The Wrigley Riddle

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Ballpark Mysteries 7: The San Francisco Splash

By Mark Meyers, David A. Kelly

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Time for a seventh-inning stretch! The San Francisco Splash is book #7 in our early chapter book mystery series, where each book is set in a different American ballpark! Splash! A hit soars over...

Ballpark Mysteries 8: The Missing Marlin

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It's the eighth inning! The Missing Marlin is book #8 in our early chapter book mystery series, where each book is set in a different American ballpark!Mike and Kate are in Miami visiting Kate's Un...

Ballpark Mysteries 9: The Philly Fake

By Mark Meyers, David A. Kelly

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It's the ninth inning! The Philly Fake is book #9 in our early chapter book mystery series, where each book is set in a different American ballpark!What better city to spend the Fourth of July than...

Ballpark Mysteries 1: The Fenway Foul-up

By David A. Kelly

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Now leading off the line-up—book #1 in a brand-new early chapter book mystery series where each book is set in a different American ballpark! Thanks to Kate's mom, a sports reporter, cousins Mike W...

Ballpark Mysteries 2: The Pinstripe Ghost

By David A. Kelly

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Batting second—and perfect for Halloween—book #2 in an early chapter book mystery series where each book is set in a different American ballpark! Mike and Kate are waiting for Kate's mom at a borin...

Ballpark Mysteries 4: The Astro Outlaw

By David A. Kelly

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Now batting clean-up—book #4 in a new early chapter book mystery series where each book is set in a different American ballpark! Houston, we have a problem! Before a game at the Astros' ballpark, M...

Ballpark Mysteries 5: The All-Star Joker

By David A. Kelly

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Next up to the plate—book #5 in our early chapter book mystery series, where each book is set in a different American ballpark! The stars are out in Kansas City . . . the baseball stars, that is! M...

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.