. . "Since 1903" . . "Panama" . . "Panama Canal (Panama)" . . . . . . "The Panama Canal Isthmian political instability from 1821 to 1976"@en . . . "The Panama Canal" . . "The Panama Canal : isthmian political instability from 1821 to 1976" . . . "The Panama Canal : Isthmian political instability from 1821 to 1976"@en . . . . . . "The Panama canal : isthmian political instability from 1821 to 1976" . .