11. Appropriations. Estimates for The Panama Canal, 1928. Bookmark Corporate/Agency Authors: Panama Canal Publisher: Panama Canal Date: 1926 SuDoc number: W 79.11/2:Es 8/928
12. Appropriations. Estimates for The Panama Canal, 1927. Bookmark Corporate/Agency Authors: Panama Canal Publisher: Panama Canal Date: 1925 SuDoc number: W 79.11/2:Es 8/927