General report - International Tin Research and Development Council.

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Item Link Original Source
Limited (search only)   1st-2nd (1934-37) University of Minnesota
Limited (search only)   3rd-4th (1938-39) University of Minnesota
Limited (search only)   1934 1934 The Ohio State University
Limited (search only)   1937 1937 The Ohio State University
Limited (search only)   1939 1939 The Ohio State University