Other important collections within the U.S. Serial Set defy classification by origin. These include a number of volumes containing unusual historical data, as well as: hearings; reports; exhibits of congressional and executive branch commissions; and investigations and inquiries, such as studies of wages and prices, immigration, woman and child labor, unemployment, national security, conduct of war, and civil rights. The "Final Report and Testimony of Industrial Relations Commission", classified as a Senate document, is an 11-volume set of reports, exhibits, and testimony on the "general condition of labor in the principal industries of the U.S. . . . and the underlying causes of dissatisfaction in the industrial situation". The volumes contain almost 11,000 pages of testimony from hundreds of witnesses, including Samuel Gompers, Frederick W. Taylor, Louis Brandeis, Clarence Darrow, John D. Rockefeller, Jr. and Sr., J. P. Morgan, Henry Ford, and Andrew Carnegie. A reprint of the British "Political and Economic Report of the Committee To Collect Information on Russia", also classified as a Senate Document, is a 1920 analysis of the situation in Russia after three years of Communist rule.