A Calculus of Angels

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A Calculus of Angels
J. Gregory Keyes - A Calculus of Angels.jpeg
Author Gregory Keyes
Cover artist Therese Nielsen
CountryUnited States
LanguageEnglish
Series The Age of Unreason
Genre Alternate history, fantasy
Publisher Del Rey
Publication date
March 30, 1999
Media typePrint (Paperback)
Pages406
ISBN 978-0-345-40607-1
OCLC 39695456
813/.54 21
LC Class PS3561.E79 C35 1999
Preceded by Newton's Cannon  
Followed by Empire of Unreason  

A Calculus of Angels is an alternate history and fantasy novel by American writer Gregory Keyes, the second book in The Age of Unreason series. [1] [2] It was initially published by Del Rey on March 30, 1999. A follow-up to Newton's Cannon , the book is set in 1722 and continues the alternate history where Isaac Newton discovers that alchemy works, and a powerful science is built upon it.

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