Hal Marcovitz Books

Sir Ernest Shackleton and the struggle against Antarctica

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Examines the life and work of British explorer Sir Ernest Shackleton, focusing on his repeated attempts to reach the South Pole in the early twentieth century.

Sir Ernest Shackleton and the Struggle Against Antartica Explorers of New Worlds

By Hal Marcovitz

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Vasco Nunez De Balboa and the Discovery of the South Sea

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John C. Fremont

By Hal Marcovitz

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John Smith

By Hal Marcovitz

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Sitting Bull Famous Figures of the American Frontier

By Hal Marcovitz

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Sitting Bull Famous Figures of the American Frontier

By Hal Marcovitz

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George Custer

By Hal Marcovitz

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The life of the Civil War general whose controversial fame rests chiefly on the disaster at the Little Big Horn in 1876.

George Custer

By Hal Marcovitz

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The life of the Civil War general whose controversial fame rests chiefly on the disaster at the Little Big Horn in 1876.

The Balkans

By Hal Marcovitz

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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.