Mike Friedrich Books

Werewolf by night

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More howling great adventures starring Jack Russell - the Werewolf by Night! Whether it's death in the cathedral, courtesy of none other than the Hunchback of Notre Dame, or murder by moonlight at...

Marvel Masterworks

By Mike Friedrich, Carole Seuling, Steve Gerber

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MARVEL MASTERWORKS KA ZAR HC VOL 2 DM VAR ED 257 GIL KANE COVER

By Mike Friedrich

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Crisis on Multiple Earths

By Dick Dillin, Len Wein, Dennis O Neill

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Batman

By Mike Friedrich, Denny O Neil, N. Adams, Bob Haney, Nick Giordano

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Essential Marvel Horror Vol. 1

By Bob McLeod, Mike Friedrich, Gene Colan, Gary Friedrich, Jim Mooney, Bill Mantlo, Ed Hannigan, Sal Buscema, Tony Isabella, Tom Sutton, Herb Trimpe, John Warner, Sonny Trinidad, Gerry Conway, Roy Thomas, Chris Claremont, Craig Russell, Steve Gerber, Jim Starlin, Russ Heath

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Essential Captain Marvel Volume 2

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Marvel Masterworks

By Marvel Comics

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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.