1942-1945
.
Literatuur: KANAALZONE
Brooks, T. WWII – CANAL ZONE CENSORSHIP – A FOLLOW UP. CCSG 2011, 38, 1, p 5-6.
Metzler, H.A. (1981) World war II civil censorship in the Canal Zone. The Canal Zone Philatelist 17, 3, p 17-24.
Metzler, H.A. WORLD WAR II – Civil Censorship in the Canal Zone. CCSG 1982, 10, 2, p 20-23.