Robert Leininger Books

The Tenderfoot
Killing Suki Flood
Sunspot
Sunspot

By Robert Leininger, Rob Leininger

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"The sunspot was huge. Nothing like it had ever been seen before--a twenty-billion square mile blot on the surface of the sun, and growing. Dr. Morris Tyler at Northern Arizona University in Flagst...

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Gumshoe For Two
Gumshoe On The Loose (3) (The Mortimer Angel Series)
Gumshoe Rock
Gumshoe Rock

By Robert Leininger, Rob Leininger

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FEMME FATALE
FEMME FATALE

By Robert Leininger

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Gumshoe Gone
Gumshoe Gone

By Robert Leininger, Rob Leininger

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Liar-In-Chief
Liar-In-Chief

By Robert Leininger

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Gumshoe
Gumshoe

By Robert Leininger, Rob Leininger, Leininger, Rob

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USA Today best-selling author IRS agent, feared and despised—a gumshoe for only four hours—finds Reno's missing mayor's head For nine long days, the mayor and district attorney of Reno, Nevada, hav...

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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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