Sean Callahan Books

A is for Ara

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Private Health Sector Assessment in Tanzania

By Grace Chee, Emmanuel Malangalila, Ilana Ron Levey, Adeline Kimambo, Kim McKeon, Jorge Coarasa, Sean Callahan, Barbara O Hanlon, James White

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100 Things Nebraska Fans Should Know Do Before They Die

By Sean Callahan

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"The University of Nebraska-Lincoln is one of the most storied and decorated football programs in NCAA history--since its inception in 1890, the program has claimed five National Championships, all...

Margaret Bourke White

By Sean Callahan, Margaret Bourke White

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Photographs of Margaret Bourke White

By Sean Callahan, Margaret Bourke White

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The bear hug

By Sean Callahan

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Cubby loves spending time with Grandpa Bear, especially when Grandpa gives him the Bear Hug.

A wild Father s Day

By Sean Callahan

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As they enjoy indoor and outdoor activities on Father's Day, a father and his children pretend to be wild animals.

A wild day with dad

By Sean Callahan

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A father invites his children to join him in spending an entire day pretending to be wild animals.

The leprechaun who lost his rainbow

By Sean Callahan

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When Roy G. Biv, a leprechaun, appears and asks Colleen's help in saving the St. Patrick's Day parade, she offers items of different colors to rebuild his lost rainbow, but is reluctant to part wit...

The Leprechaun Who Lost His Rainbow

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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.