Panama Canal toll formula. : Hearing before the Subcommittee on Panama Canal of the Committee on Merchant Marine and Fisheries, House of Representatives, Eighty-sixth Congress. second session, on H.R. 8983, to require Panama Canal tolls to be prescribed in accordance with the tolls formula provided in section 412 of title 2 of the Canal Zone code, and pursuant to the provisions of the Administrative procedure act, and H.R. 10968, to amend section 412 (b) of title 2 of the Canal Zone code.