Hours of labor. Thirty-hour work week, hearings before subcommittee, 74th Congress, 1st session, on S. 87, to prevent shipment in interstate commerce of certain articles and commodities, in connection with which persons are employed more than 5 days per week or 6 hours per day, and prescribing certain conditions with respect to purchases, and loans by United States, and codes, agreements, and licenses under national industrial recovery act, Jan. 31-Feb. 16, 1935.