"Build Your Own Metal Working Shop From Scrap" by David Gingery which covers everything from building a foundry to making all your tools from first principles using nothing but river sand and junk metal for smelting.
"On Trails" by Robert Moore that discusses how walking paths from the first peoples persist, grow and change over hundreds of years, along with advances in walking trail design in recent years to become a part time recreational activity vs the pure utility of terrain traversal as they first were. Covers how a trail is a "living thing", as it were, because any who tread on it help reinforce it. Covers non human trails like ants and their reenforcement via pheromones and the like.