Mark Acres Books

Indomitable Thunder
Indomitable Thunder

By Mark Acres

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Dragonspawn
Dragonspawn

By Mark Acres

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Dragon War
Dragon War

By Mark Acres

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Star Frontiers Module SF1
Gangbusters
Gangbusters

By

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Tomb of the Lizard King Advanced Dungeons and Dragons module I2
Death on the Docks Gangbusters Module GB3
The Vanishing Investigator Gangbusters module GB4
Combat Command in the World of Jerry E. Pournelle's Janissaries, Lord of Lances (Combat Command)
Shines The Name
Shines The Name

By Todd Cameron Hamilton, Gary Gygax, Mark Acres, Don Dixon, All Authors, James Clouse

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Julian Penn, starship trooper, leads his infantry against both Bug and Skinny forces. In this book you command a squad of Robert Heinlein's Mobile Infantry (M.I.) on a mission. In each section of t...

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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.

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