America's petroleum industries pour out fuel and lubricants for the United Nations. An oil well, marked by a tall, steel derrick, is producing oil for the United Nations in the garden of a private home in Oklahoma City, capital of the U.S. southwest state of Oklahoma. Oil industrialists in the U.S. have searched for oil over nearly every foot of the ground in America. They are aided in their search by geology experts trained in reading the surface of the ground as well as test borings to detect the presence of oil, often at great underground depths. In the case of Oklahoma City the town was built before it was discovered that rich petroleum deposits lay under the town site. Oil wells were even drilled on the State House grounds near the state's Capitol building, and the flow from these wells enriched the coffers of the state government. What geologists call the "diligence" of U.S. seekers after oil has made the U.S. a great oil producing nation, though it contains but 15 percent of the proven oil deposits of the world