Gloria Skurzynski Books

On time

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Examines the ways humans have measured time throughout history and discusses the various units that are used to keep track of it.

Wolf Stalker Mysteries in Our National Park

By Gloria Skurzynski, Alane Ferguson

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Cliff Hanger Mysteries in Our National Park

By Gloria Skurzynski, Alane Ferguson

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Deadly waters

By Gloria Skurzynski

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While visiting the Everglades National Park with their parents, the Landon children uncover the mystery of dying manatees and learn important lessons about the natural environment.

The Hunted Mysteries in Our National Park

By Gloria Skurzynski, Alane Ferguson

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Out of the deep

By Gloria Skurzynski

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Jack, Ashley, and their unreliable new foster sister set out to solve the mystery of why whales are beaching themselves at Acadia National Park.

Out of the deep

By Gloria Skurzynski

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Jack, Ashley, and their unreliable new foster sister set out to solve the mystery of why whales are beaching themselves at Acadia National Park.

Running scared

By Gloria Skurzynski

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While lost in a tunnel at Carlsbad Cavern, thirteen-year-old Jack, eleven-year-old Ashley, and their eight-year-old foster brother, Sam, think bats and darkness are their worst problems, until they...

The Minstrel in the Tower

By Gloria Skurzynski

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Caitlin s Big Idea

By Gloria Skurzynski

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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.