25 books in series

Discworld Companion Books

Discworld Companion Books is a 25-book series with 25 primary works first released in 1994 with contributions by Terry Pratchett, Stephen Briggs, G. Ogg, Terry; Pearson Pratchett, Paul Kidby, Jacqueline Simpson, and The Discworld Emporium.

The Wit And Wisdom Of Discworld
The Art of Discworld
The Folklore of Discworld
Discworld Companion
Turtle Recall: The Discworld Companion...So Far
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The New Discworld Companion

The Compleat Ankh-Morpork
The Discworld Almanak: The Year of the Prawn
The Compleat Ankh-Morpork: City Guide
Nanny Ogg's Cookbook
Turtle Recall: The Discworld Companion . . . So Far
The Ankh-Morpork Post Office Handbook: Discworld Diary 2007
Lu-Tze's Yearbook of Enlightenment 2008
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Nanny Ogg's Cookbook

Discworld's Unseen University Diary 1998
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Discworld Fools' Guild Diary 2001

Discworld Assassins' Guild Yearbook and Diary 2000
Discworld's Ankh-Morpork City Watch Diary, 1999
The Ankh-Morpork Archives, Volume II
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The Folklore of Discworld

Discworld Thieves' Guild Yearbook & Diary 2002
The Discworld (Reformed) Vampyre's Diary 2003
The Terry Pratchett Diary
The Ultimate Discworld Companion
The Discworld Companion