The mines in southwestern Colorado were in trouble and needed cheap, reliable electric power to keep running. This is the story of innovative solutions to solve the problem using alternating current... This description may be from another edition of this product.
ThriftBooks sells millions of used books at the lowest everyday prices. We personally assess every book's quality and offer rare, out-of-print treasures. We deliver the joy of reading in recyclable packaging with free standard shipping on US orders over $15. ThriftBooks.com. Read more. Spend less.