TO ARGENTINA: 1939-48 group inc. Mar. 1944 env. from undercover P.O. box in London for Polish Army personnel by air to First National Bank of Boston in Buenos Aires franked 8d Pink + 7d Green cancelled by duplex blacked out by censor disc, stamped "DESCONOCIDO" (unknown) & returned to sender; 1942 underpaid env. from Lisburn(?) to Monte Caseros franked 2½d Ultramarine with hexagonal "T" hs & ms "8" on the front plus v. large boxed "SURCHARGED OWING TO/INSUFFICIENT POSTAGE./PREPAID 2½D INSTEAD OF 3D./PLEASE ADVISE SENDER." hs on reverse; etc. (22 covers) Cross Reference: ARGENTINA, MILITARY - CENSORED MAIL, POLAND (Image)

TO BOLIVIA, BRAZIL & BRITISH GUIANA: 1938-48 group inc. 8 Nov. 1949 env. from Seaford by airmail to George Town, British Guiana franked 2d Orange + 2 x 11d Plum; 11 Apr. 1945 2d P.Stat. PC from Hamstead by air to Sao Paulo franked 10d Blue (12d airmail PC rate) with fine purple octagonal "[crown]/PASSED/P 174" censor; 20 Oct. 1939 airmail env. from Birmingham to La Paz, Bolivia franked 2 x 1/- Brown + 3d Violet with hexagonal "T" hs & ms "660" charge; etc. (22 covers) Cross Reference: BOLIVIA, BRAZIL, BRITISH GUIANA/GUYANA, MILITARY - CENSORED MAIL (Image)

TO CANAL ZONE - VENEZUELA, CHILE, COLOMBIA, MEXICO, ETC.: 1937-54 group inc. 25 Feb. 1943 env. from Northampton by air to Nicaragua franked Health & Pensions Insurance 9d Yellow-Brown single on the front with "EXAMINED BY/8459" censor label; 18 Aug. 1939 env. from Bradford by air to Asuncion, Paraguay franked 6d blocks of 4 (2) cancelled by rubber "BRADFORD" cds with purple fine "CORREO AEREO/ASUNCION-PARAGUAY" cds; etc. (40 covers) Cross Reference: MEXICO, NICARAGUA, REVENUES, PANAMA & CANAL ZONE (Image)