Panama Canal. Amending Canal Zone retirement law, hearings, 76th Congress, 1st session, on H. R. 141, to amend Canal Zone code so as to provide for 30-year national retirement, H. R. 142, to amend Canal Zone code so as to provide for widows' annuities, and H. R. 1819, to amend sec. 92, title 2, of Canal Zone code, and for other purposes, Mar. 23, 1939.