Mark De Castrique Books

Blackman s Coffin

By Mark De Castrique

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Dangerous Undertaking A Poisoned Pen Press Mystery

By Mark Castrique

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Secret undertaking

By Mark De Castrique

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"Towns like Gainesboro, North Carolina, may be small but go big on local traditions. When funeral director and part-time deputy sheriff Barry Clayton and his childhood nemesis, Archie Donovan, Jr.,...

Blackman s Coffin

By Mark De Castrique, William Dufris

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Blackman s Coffin

By Mark De Castrique

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A Conspiracy of Genes

By Mark De Castrique, Paul Michael Garcia

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Final Undertaking

By William Dufris, Mark De Castrique

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A murder in passing

By Mark De Castrique

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"The Blackman and Robertson Detective Agency faces a disturbing reality: no clients. So when partner Nakayla Robertson suggests a mushroom hunt at the historic, freed-slave commune The Kingdom of t...

A murder in passing

By Mark De Castrique

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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.