The Martin Sponholz Papers, dated 1965-1968, are photographic slides of pictures Martin Sponholz took while he was a member of Operation Deepfreeze-66 Expedition and the Japanese Antarctic Research Expedition. Sponholz numbered and wrote captions beneath the slides. Those numbers and captions are used in the inventory list as titles. The slides marked DF relate to the United States Antarctic Research Program’s Deepfreeze-66 Expedition at Plateau Station, dating 1965-1966. The photographs Sponholz took on this expedition feature the building of the Plateau Station and its facilities, tools and instruments used to measure wind and temperature, and Antarctica’s landscape. The slides marked J relate to the photographs Sponholz took on Japanese Antarctic Research Expedition, dating 1967-1968. The photographs Sponholz took on this expedition feature meteorology equipment, Antarctica’s landscape and animals, and Syowa Base.