Sandra Markle Books

Creepy, crawly baby bugs

By Sandra Markle

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Offers a close look at baby insects, those animals which are nicknamed "bugs."

Super cool science

By Sandra Markle

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Text and photographs tell the story of science research stations at the South Pole, including the one currently under construction which will launch a new era of science.

Super cool science

By Sandra Markle

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Text and photographs tell the story of science research stations at the South Pole, including the one currently under construction which will launch a new era of science.

Down Down Down in the Ocean

By Sandra Markle

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Outside and Inside Giant Squid

By Sandra Markle

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Outside and Inside Giant Squid

By Sandra Markle

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Describes the inner and outer workings of giant squids, enormous deep-sea creatures that have never been seen alive, discussing their diet, anatomy, and reproduction.

Outside and Inside Killer Bees

By Sandra Markle

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Outside and Inside Killer Bees Outside and Inside Walker Company

By Sandra Markle

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Outside and Inside Mummies

By Sandra Markle

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Outside and Inside Mummies

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.