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Please be aware that in searching by ISBN prefix you will return all records whose prefix contains the string of digits you have searched for. Thus a search on a string of digits that forms a full, valid ISBN prefix (e.g. 978-0-19) will not only return this record but all other valid prefixes containing that string (e.g. 978-0-9780191).

What is the Global Register of Publishers?

The Global Register is a free resource including:

addresses and other contact details for publishers in more than 200 countries and territories*
data on over a million ISBN prefixes
thousands of small and author-publishers

*Full contact information for publishers is available free of charge to registered users. See Using the register