Nonfiction » Engineering, trades, and technology » Mining

The (Secret) History of Gold Prospecting in the United States, and the 38 States Where Gold Has Already Been Found!
Price: Free! Words: 8,430. Language: English. Published: November 3, 2015. Categories: Nonfiction » Business & Economics » Home-based businesses, Nonfiction » Engineering, trades, and technology » Mining
The U.S. Geological Survey conservatively estimates that there are over 13,200 metric tons of undiscovered gold in the lower 48 states worth more than $514 Billion dollars. This free eBook introduces the average American to a profound fact: with a basic introduction to the right tools and the free scientific resources available online, ANY American can find that gold!
The New Vauban: An Essay
Price: Free! Words: 4,190. Language: English. Published: October 18, 2014. Categories: Nonfiction » History » War, Nonfiction » Engineering, trades, and technology » Mining
Mobile towers suggested for defense over trenches in conventional warfare. Interchangeable body armor and shields through piecework parts. Mole machines, earthquake warfare and deep citadels reviewed and opined upon. Basics of fortification is discussed.