Unknown Author
United States. Congress. Senate. Committee on Finance
John Robert Connelly
United States. Congress. Joint Committee on Internal Revenue Taxation.
Standard Oil Company of New Jersey.
United States. Congress. Senate. Committee on Finance. Subcommittee on Energy.
Standard Oil Company.
Carl Michael Ryer
Arno Mahlert
Mid-continent Oil and Gas Association.
Oscar H. Lentz
National Limestone Institute (U.S.)
Ronald D. Lacewell
Mid-continent Oil and Gas Association
American Petroleum Institute
United States. Internal Revenue Service.