Richard Glyn Roberts Books

Pa beth yr aethoch allan i w achub

By Simon Brooks, Richard Glyn Roberts

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Diarhebion llyfr coch Hergest

By Richard Glyn Roberts

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Contains the two largest collections of medieval Welsh proverbs from the Red Book of Hergest, circa 1400 and discusses sources and their mostly ‘non-Celtic’ character. Linguistic and textual notes...

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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.

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