Interview with J. Frank Rollins, an oilman and a geophysicist, concerning his work experience with Petty Geophysical Engineering Company doing refraction seismic work; his employment with Geophysical Service, Inc.; doing reflection and refraction work in 1936; oil exploration in South America; work in oil field instrumentation equipment; work as a "computer" interpreting geological data; founding of Rayflex Exploration Company in 1948; technological developments for oil field exploration; geochemical surveying; the sale of Rayflex to Phillips-Eckhart in 1962; his work as a geophysical consultant; the application of oil field technology to national defense; German espionage activity in South America during World War II; and pro-German activity in South Louisiana during World War II.

Interview with John Bateman concerning his recollections of the Crater of Diamonds and diamond mining near Murfreesboro, Arkansas from 1930 to 1950. Appendix includes 2 maps: a "Geologic Map of the Prairie Creek Area of Peridotite in T. 8 S., R. 25 W., 2 1/2 Miles South-Southeast of Murfreesboro, Pike County, Ark." and a map showing the locations of various landmarks in the Crater of Diamonds State Park area.

Interview with Willa Mae Bateman concerning her recollections of the Crater of Diamonds and diamond mining growing up in Murfreesboro, Arkansas.

Interview with Murdo MacIver, an executive at Caltex Petroleum Corporation, discussing his experiences with the company. He comments on his educational background and early employment, his employment with Standard Oil Company of California, his transfer to Caltex in 1938, the expansion before World War II, Caltex during World War II, Bapco's refinery expansion, financing postwar refinery expansion, foreign exchange problems, banking syndicates, accounting methods, tanker construction, training of local nationals, T-2 tankers, the relationship between Caltex and subsidiaries, and Third World financial problems.

Interview with William Taylor, an executive at Caltex Petroleum Corporation from New York, about his experiences working for the company in the Philippines and Thailand, the joint venture refinery in Thailand, expansion of the company, and the move of headquarters from New York to Dallas.

Interview with Harrell Edmund Chiles, Chief Executive Officer and Chairman of the Board of the Western Company. He discusses his family, formation of the Western Company, oil exploration, history of the oil industry in Texas, his political views, and his "I'm Mad" campaign.