David A. Kelly Books

Ballpark Mysteries 7 The San Francisco Splash

By David A. Kelly

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Ballpark Mysteries 8: The Missing Marlin

By David A. Kelly

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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 U...

The missing marlin

By David A. Kelly

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"Mike and Kate are visiting the Miami Marlins ballpark when some rare animals from the ballpark's fish tanks go missing"--

Ballpark Mysteries 9: The Philly Fake

By 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...

The Philly fake

By David A. Kelly

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Cousins Mike and Kate must help the Philadelphia Phillies' mascot, the Phillie Phanatic, clear his name after the team's bats begin to suspiciously break during games. Cousins Mike and Kate must h...

Ballpark Mysteries 10: The Rookie Blue Jay

By David A. Kelly

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Batter up! Ballpark Mysteries combine baseball action with exciting whodunits for early chapter book readers! Mike and Kate can’t wait to watch their rookie hero Dusty Martin in action. But somet...

Ballpark Mysteries 10

By David A. Kelly

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Ballpark Mysteries 11: The Tiger Troubles

By David A. Kelly

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Batter up! Ballpark Mysteries® combine baseball action with exciting whodunits for early–chapter book readers! Someone is blackmailing the Detroit Tigers’ famous slugger, Tony! They’ve stolen his...

Tiger Trouble

By David A. Kelly

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Ballpark Mysteries 13: The Capital Catch

By David A. Kelly

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Batter up! Baseball action and exciting whodunits star in this series! Next up is Washington D.C. and the Nationals team! Mike and Kate are about to face their biggest, most important mystery yet...

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.