Panama Canal tolls : symposium of views protesting against a surrender of American rights and upholding the side of the Unites States in the toll controversy ; a discussion of the Hay-Pauncefote treaty, of the right of foreign nations to interfere in our domestic affairs, and of the influences back of the effort to repeal the sections of the Panama Canal act beneficial to American commerce ; extracts from Congressional record and public documents / compiled by Joseph R. Knowland ... 1912-1913.