Trends in US Coal Production
Map of the Elwha River and tributaries with dams.
Origins of Female Millhands, Hamilton Manufacturing Company, Lowell, MA 1836.
Whale Map by Matthew F. Maury, 1851
US Imports of Whale Oil and Sperm Oil.
MIT Solar House I, 1939.
Invisible Network. A Million Miles of Pipeline. TIME Map by R.M. Chapin, Jr.
Energy Information Administration, "Retail Motor Gasoline and On-Highway Diesel Fuel Prices, 1949-2011"
Historical Crude Oil Prices
United States Horse and Mule Population, 1840-1920.
Horse and Mule Population Statistics