Preston Gralla Books

Describes the sources of information and entertainment available online and how to get to them and lists specific sites according to such categories as computers, sports, games, and even homework.

Online kids

By Preston Gralla

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Describes the sources of information and entertainment available online and how to get to them and lists specific sites according to such categories as computers, sports, games, and even homework.

Online Activities for Kids: Projects for School, Extra Credit, or Just Plain Fun!

By Preston Gralla

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Step-by-step instructions for doing more than eighty Internet search activities in such areas as science, math, social studies, language arts, geography, and the arts.

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.