1. Panama Canal review, Aug. 4 and Nov. 3, 1950; v. 1, no. 2 and 3. Bookmark Corporate/Agency Authors: Panama Canal Publisher: Panama Canal SuDoc number: PaC 1.11:1/2-3
2. Panama Canal review, Feb. 2 and May 4, 1951; v. 1, no. 4 and 5. Bookmark Corporate/Agency Authors: Panama Canal Publisher: Panama Canal SuDoc number: PaC 1.11:1/4-5