Allan R. Ellenberger Books

Ramon Novarro

By Allan R. Ellenberger

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Margaret O'Brien

By Allan R. Ellenberger

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"What was it like to grow up on the silver screen, surrounded by Hollywood's biggest stars? Where did life lead Margaret O'Brien as she blossomed from moppethood to maturity? When she looks back to...

The Valentino mystique

By Allan R. Ellenberger

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"The circumstances surrounding the death of legendary star Rudolph Valentino have been a constant source of fascination for admirers worldwide. This work examines every aspect of his passing, analy...

Margaret O Brien

By Allan R. Ellenberger

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Miriam Hopkins

By Allan R. Ellenberger

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"In the first comprehensive biography of this colorful performer, Allan R. Ellenberger illuminates Hopkins's fascinating life and legacy. Her freewheeling film career was exceptional in studio-era...

Valentino Mystique

By Allan R. Ellenberger

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Ramon Novarro

By Allan R. Ellenberger

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Celebrities in the 1930 Census

By Allan R. Ellenberger

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Celebrities in Los Angeles Cemeteries

By Allan R. Ellenberger

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Celebrities in the 1930 census

By Allan R. Ellenberger

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"This directory provides an extensive listing of household information collected for over 2,500 famous or notorious individuals who were alive during the 1930 United States Census. Figures from the...

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.