My dad wrote a book that I forgot about · 1:27am May 5th, 2017
I totally forgot that this existed. It said its the best in its topic.
It's also the only on its topic.
I present to you:
The Caves of Pennsylvania in the Eighteenth Century.
(5 stars on amazon)
https://www.amazon.com/Caves-Pennsylvania-Eighteenth-Century/dp/0989656500