John R. Tunis Books

All-American

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After he and a fellow player on the football field gang up on a Jewish member of the opposing team and cause him a serious neck injury, seventeen-year-old Ronny leaves his elite all-white private s...

Keystone Kids

By Tunis John Roberts, John R. Tunis

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When two young brothers join the Brooklyn Dodgers, one becomes team manager and is faced with the task of uniting a team rife with dissension and prejudice against the new Jewish rookie catcher.

The Kid from Tomkinsville

By Tunis John Roberts, John R. Tunis

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As the newest addition to the Brooklyn Dodgers, young Roy Tucker's pitching helps pull the team out of a slump; but, when a freak accident ends his career as a pitcher, he must try to find another...

Rookie of the Year

By John R. Tunis

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Triple Play

By John R. Tunis

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Champion's choice

By Tunis John Roberts

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Recounts a girl's rise to stardom on the tennis courts, the conflicts brought by her sport career, and her eventual retirement in favor of marriage.

The Duke decides

By Tunis John Roberts

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Harvard track team captain Jim Wellington's determination to train and win helps him get a place on the U.S. Olympic team in the 1938 Olympic Games in Berlin. Sequel to "The Iron Duke."

Keystone kids

By Tunis John Roberts

Average: 0.00, 0 Ratings

When two young brothers join the Brooklyn Dodgers, one becomes team manager and is faced with the task of uniting a team rife with dissension and prejudice against the new Jewish rookie catcher.

Keystone kids

By Tunis John Roberts

Average: 0.00, 0 Ratings

When two young brothers join the Brooklyn Dodgers, one becomes team manager and is faced with the task of uniting a team rife with dissension and prejudice against the new Jewish rookie catcher.

The Kid from Tomkinsville

By John R. Tunis

Average: 0.00, 0 Ratings

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.