A CALCULUS OF ANGELS


'''A Calculus of Angels''' is the second book in Gregory Keyes' ''The Age of Unreason'' series. 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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Known ISBNs

Known ISBNs



★ ISBN 0-330-41998-6

★ ISBN 0-345-40608-7

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