Mark London Williams Books

Curious George Tadpole Trouble

By H.A. And Margret Rey, Mark London Williams

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Ancient fire

By Mark London Williams

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When twelve-year-old Eli becomes involved with the time travel experiments that the government pressures his parents to pursue, he travels to fifth-century Alexandria, Egypt, where he meets Thea, a...

Dragon sword

By Mark London Williams

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Twelve-year-old time traveler Eli Sands continues his search for his missing mom, encountering new characters and trying to save the free world from tyrannical rule.

Trail of bones

By Mark London Williams

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Time travelers Eli and Thea arrive in Missouri in 1804, where they meet Thomas Jefferson and other famous people, then Eli joins the Corps of Discovery, hoping to find Clyne so that the three frien...

City of ruins

By Mark London Williams

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Having traced a dimensional rift to Jerusalem in 583 B.C.E., DARPA sends thirteen-year-old Eli and his friends into the past to try to prevent the unraveling of history and the spread of the deadly...

Dragon Sword

By Mark London Williams

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Trail of bones

By Mark London Williams

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City of Ruins

By Mark London Williams

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Trail of bones

By Mark London Williams

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Dragon Sword Danger Boy

By Mark London Williams

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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.