Book Collecting Guides

One Girl Collecting Guides

Philosopher's Stone, Sorcerer's Stone, first edition

What is My Harry Potter Worth?

Trying to figure out whether your copy of Harry Potter and the Philosopher’s Stone is a first issue? Want to know how much your “first edition” of Harry Potter and the Sorcerer’s Stone is worth?

This eBook covers first issue points for the first book in the Harry Potter series. 

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What is My Harry Potter Worth? pt. 2

The second in this eBook series focusses on helping you to identify whether or not your copy of Harry Potter and the Chamber of Secrets is a first issue / first printing, and if so, what value it might have.

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Prisoner of Azkaban first edition

What is My Harry Potter Worth? pt. 3

The third in this eBook series focusses on issue points for Harry Potter and the Prisoner of Azkaban, including how to identify if your American edition is a first, second, or third state first printing (it can get a little convoluted).

Like the other guides in this series, it covers book club editions and the many U.K. paperbacks.

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Signed Editions, Autopen, Facsimile, and fake signatures

Signed Editions & Autopen Identifiers

This book collecting guide helps you to understand the value of a signed edition (whether it’s flat-signed, tipped-in, or inscribed) and gives you the tools to identify a variety of signature types including secretarial, autopen, and facsimile.

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Collecting Science Fiction Book Club Editions


This eBook features a full list of Science Fiction Book Club titles and gutter codes from 1953-2000, as well as a list of first edition titles and valuable SFBC editions.

Coming Soon

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