Many stories in The Time-travelling Caveman – written by Pratchett when he was a journalist in the 60s and 70s – have never been published in a book
A Stroke of the Pen, Terry Pratchett - At Home A Lot
Fantasy Author Sir Terry Pratchett Dead at 66
Terry Pratchett: A Life With Footnotes: The Official Biography (Paperback)
the discworld graphic novels adapted from Terry Pratchett by Scott Rockwell & illustrated by Steven Ross – Triumph Of The Now
Mort: A Novel of Discworld (Discworld, 4): 9780062225719: Pratchett, Terry: Books
Mort: A Novel of Discworld (Discworld, 4)
Preview: Tiffany Aching's Guide to Being a Witch
Terry Pratchett's 10 Best Discworld Novels - Paste Magazine
The Shepherd's Crown: Terry Pratchett's Last Discworld Novel - A Pilgrim in Narnia
Bonus post: Where to start with Terry Pratchett – Verity Reads Books (lots of them)
Framework, unfinished: Terry Pratchett's The Shepherd's Crown – Kate Macdonald
Wintersmith - Wikipedia