Book excerpt: Terminology: Proved Reserves and Undiscovered Resources: The Importance of Terminology: The Example of the Bakken Formation; Conventional Versus Unconventional Oil and Natural Gas Deposits; (4) Authoritative Data Sources for U.S. Fossil Fuel Reserves and Resources (R&R); (5) U.S. Oil and Natural Gas R&R: Proved Reserves; Undiscovered Oil and Natural Gas R&R; Sub-Economic Oil and Natural Gas R&R; Shale Oil; Shale Gas; Methane Hydrates; Heavy Oil; (6) U.S. Coal R&R; (7) Expressing Fossil Fuels as Barrels of Oil Equivalent; (8) Overview of Global Fossil Fuel R&R; (9) U.S. Production and Consumption of Oil, Natural Gas, and Coal; Key Terms Used in Oil Statistics. Illus.