Sandra Markle Books

After the spill

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Examines the impact of the 1989 Exxon Valdez oil spill on the environment and people of Prince William Sound and describes the steps taken to minimize the damage and prevent a recurrence.

After the spill

By Sandra Markle

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Examines the impact of the 1989 Exxon Valdez oil spill on the environment and people of Prince William Sound and describes the steps taken to minimize the damage and prevent a recurrence.

Army Ants

By Sandra Markle

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Jackals

By Sandra Markle

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Wolverines

By Sandra Markle

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Hands On Science

By Sandra Markle

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In Search of Graphics

By Sandra Markle, William Markle

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What happens next?

By Sandra Markle

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What happens next?

By Sandra Markle

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Case of the Vanishing Little Brown Bats

By Sandra Markle

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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.