State taxation of Interstate Commerce : hearings before the Committee on Finance, United States Senate, Eighty-sixth Congress, first session, on S.J. Res. 113, to bring about greater uniformity in state taxation of business income derived from interstate commerce; to establish a commission on taxation of Interstate Commerce; and for other purposes; S. 2213, abill to limit the power of the states to impose income taxes on income derived exclusively from the conduct of Interstate Commerce; S. 2281, a bill to prescribe limitations on the power of the states to impose income taxes on business entities engaged in interstate Commerce. July 21 and 22, 1959