Economic concentration in the meatpacking industry : hearing before the Subcommittee on Nutrition and Investigations of the Committee on Agriculture, Nutrition, and Forestry, United States Senate, One Hundred First Congress, second session, on consolidation and concentration in the meatpacking industry; the causes and forces behind these changes, and the impacts of the consolidation and concentration upon livestock producers, consumers, workers, and communities, July 20, 1990.