P. D. Hillyard Books

Little Miss Muffet is not the only one who's ever been terrified by a spider. In fact, arachnophobia, or the fear of spiders, afflicts millions around the world. Some people are so tormented that t...

The Private Life of Spiders

By Paul Hillyard

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Insects and Spiders (Picturepedia) by Hillyard, P. D.

By P. D. Hillyard

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Presents, in text and illustrations, the characteristics and habits of a variety of insects and spiders.

Ticks of North west Europe Synopses of the British Fauna

By P.D. Hillyard, Paul D. Hillyard

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Harvestmen

By P. D. Hillyard

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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.