The Color of Magic by Terry Pratchett (1983, ISBN 978-0-06-085592-5)
 

 Wikipedia says-- The Colour of Magic is a 1983 fantasy comedy novel by Terry Pratchett, and is the first book of the Discworld series.

 

Further--  The story takes place on the Discworld, a planet-sized flat disc carried through space on the backs of four gargantuan elephants – Berilia, Tubul, Great T'Phon and Jerakeen – who themselves stand on the shell of Great A'Tuin, a gigantic star turtle. The surface of the disc contains oceans and continents, and with them, civilizations, cities, forests and mountains. 

 

This is a fun novel. I enjoyed it very much. Hope to read more in the series.

Purchased at Powell's on (unknown ) for 6.98$

The Compleat Discworld Atlas by Terry Pratchett (2015, ISBN 9780857521309)

This book is an Atlas of Discworld. It has one big map of Discworld and several smaller maps of different Discworld regions. Associated with each region is a description of the geography, politics, religions and the people in the region.

Discworld is a fantasy place, based on the novels written by Terry Pratchett.

I read this book from cover to cover, but it could also be used as a reference.

Purchased from SuperBookDeals (via Amazon) on 2020-7-5 (received 2020-7-23) for 35.94$
 

The New Discworld Companion by Terry Pratchett and Stephen Briggs (2003, ISBN 0 575 07467 1)

This an encyclopedia of everything (well many things) related to Terry Pratchett's Discworld novels. The book is laid out A-Z  from Abbot, the to Zweiblumen, Jack.

I read the book cover to cover, not sure if it is meant to be read this way or just used as a reference. I found it interesting and funny.

Might be useful for those people looking for an overview of Discworld.

Purchased from Powell's (unknown date) for 9.98$