John Sentry Books

Fantastic Stories Presents The Worlds Of If Super Pack #2

By Horace B. Fyfe, Mari Wolf, Kenneth O'Hara, Jr Sam Merwin, William Campbell Gault, Tom Leahy, Kris Neville, Charles V. De Vet, Jim Harmon, Gene Hunter, Kurt Vonnegut.JR., Sam Merwin Jr., Robert J. Shea, Frank W. Coggins, Winston Marks, M. C. Pease, Keith Laumer, John Sentry, Lester Del Rey, E E Doc Smith, Arthur G. Hill, Jr. Ed M. Clinton, Kurt Vonnegut, Mark Clifton, Don Thompson, Tom Godwin, Arnold Castle, Albert Teichner, Albert Hernhuter, Richard O. Lewis, Edward E. Smith, Milton Lesser, Charles L. Fontenay, E. Everett Evans, Frank M. Robinson, Charles E. Fritch, Jr. James McKimmey, Lynn Venable, R. A. Lafferty, Hoopla Digital, Albert Hernhunter

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Worlds of If' was a three-time winner of the Hugo Award for best science fiction magazine. 'Worlds of If' discovered many talented writers who would go on to dominate genre fiction. This is the sec...

The Barbarians

By John Sentry

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History was repeating itself; there were moats and nobles in Pennsylvania and vassals in Manhattan and the barbarian hordes were overrunning the land.

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.