Coal. Extension of bituminous coal act of 1937, hearings before subcommittee, 77th Congress, 1st session, on S. J. Res. 22, S. J. Res. 32, H. J. Res. 101, and H. R. 4146, joint resolutions and act to extend provisions of bituminous coal act of 1937 for period of 2 years, and for other purposes, Apr. 2 and 3, 1941.