Gunpowder Industry
This book outlines the history of gunpowder manufacture from its development as a propellant in the fourteenth century to its eclipse by high explosives. A number of gunpowder mills can still be identified and some are now preserved and interpreted for the visitor.
Absolutely stunning and flawless. Promoted to one of my all-time favorite books. I've no clue how the author wrote this, but it is absolutely incredible.