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Subseries 1. Institute for the Unity of Science, 1939-1971

Folder 11 Institute for the Unity of Science I., 1947-1966
Folder 12 Institute for the Unity of Science II., 1965-1967
Folder 13 Institute for the Unity of Science III., 1968-1971
Folder 14 Institute for the Unity of Science IV., 1966-1969
Folder 15 Institute for the Unity of Science V., 1939-1970