1. Panama Canal, Panama Railroad Company, telephone directory. 1949 edition. Panama Canal Press, Mount Hope, C. Z. Bookmark Corporate/Agency Authors: Panama Canal Publisher: Panama Canal Date: 1949 SuDoc number: M 115.2:T 23/2/949
2. The Panama Canal telephone directory, Jan. 1, 1948. Bookmark Corporate/Agency Authors: Panama Canal Publisher: Panama Canal Date: 1948 SuDoc number: M 115.2:T 23/948