What has the author R Humphreys written?

Answer 1

R. Humphreys has written:

'Heat, light, and work' -- subject(s): Thermodynamics

Answer 2

R Humphreys is a prolific author known for writing historical fiction and non-fiction books. Some of the notable works by R Humphreys include "The Last Plague," "The Hunt for Nazi Spies," and "The French Revolution and Napoleon." Humphreys often focuses on exploring complex historical events and figures in an engaging and accessible way for readers.