Miscellaneous bills-Panama Canal : hearings before the Subcommittee on Panama Canal ... Eighty-first Congress, first session on H.R. 2140, a bill to amend the Act entitled "An act to provide for the recognition of the services of the civilian officials and employees, citizens of the United States, engaged in and about the construction of the Panama Canal," approved May 29, 1944; H.R. 2237, a bill to revise and codify laws of the Canal Zone regarding the administration of estates, and for other purposes; ... H.R. 3158 ... [and] H.R. 3159, a bill to amend the Canal Zone Code, and for other purposes. March 29, and April 5, 1949.