Assesses Panama Line's role in the operation and maintenance of the Panama Canal, and the potential economic impact of its discontinuation. Includes "Bureau of the Budget Panama Line Study," Aug. 25, 1959 (p. 311-543) and "Panama Canal Company Analysis of the Study by Drake, Starzman, Sheahan, and Barclay of the Panama Line," Nov. 19, 1959 (p. 547-736).