Antarctica: Operation Deep Freeze 1956-60: Collection of 50 covers with a range of ship cancellations and cachets, many signed by captains, crew and base members, rarer official and seasonal greetings covers, some letters, international response coupon cancelled Little America 1957 (Jan. 4) etc. incl. scarcer single day use cancellations 1960 (Feb. 17) Eights Coast, 1961 (Mar. 4) Amundsen Sea Coast (2, one official cover) and 1962 (Feb. 4) Marie Byrd Land Coast.