Kyle Puttkammer Books

Hero Cats of Stellar City

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The cutest heroes on the planet have arrived! Meet the Hero Cats of Stellar City in this, their first spectacular graphic novel. Not your ordinary house cats, they're a tactical, action-packed cove...

Hero Cats of Stellar City

By Kyle Puttkammer

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The world is getting bigger. The Hero Cats become explorers, meet the local super heroes, and finally go off to college. And could there be a love story in the making?

Hero Cats of Stellar City

By Kyle Puttkammer

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The Crow King Saga. Worlds collide and heroes unite as the cats face their biggest challenge yet! Meet Bandit as he joins the Hero Cats on a fantastical journey to save Stellar City.

Hero cats of Stellar City

By Kyle Puttkammer

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Exploring the world they saved. From the dangers of the desert, to a remote jungle island, and finally the Far East, the Hero Cats are ready for anything.

Hero cats of Stellar City

By Kyle Puttkammer

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From the streets of Stellar City to the mountains of Mars, the Hero Cats prevail. This volume features a phenomenal tour of talented artists with new visions of familiar faces.

Hero cats

By Kyle Puttkammer

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Midnight's past may be troubled, but his future looks even darker. After a prison break at the Taurus County Jail, chaos erupts on the streets of Stellar City. Now Midnight and his fellow Hero Cats...

Hero cats of Stellar City

By Kyle Puttkammer

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Winter arrives in Stellar City! Can Ace and his Hero Cats survive the cold? Season One concludes, and just wait till you see how this one ends!

Hero Cats of Skyworld a New Realm

By Kyle Puttkammer

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Bandit of Earth meets the Hero Cats of Skyworld for the first time! A perfect place for new readers to discover the exciting and dangerous realm ruled by Corvus the Crow King.

Hero Cats of Stellar City

By Kyle Puttkammer, Omaka Schultz, Ryan Sellers, Marcus Williams, Briana Higgins

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Hero Cats

By Kyle Puttkammer

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The world of Midnight is revealed. Hero Cat fans hold on tight! This is Stellar City as you've never seen it before. Our mysterious guardian is on the prowl and a confrontation with the tyrannical...

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.