Date: | 1909 |
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Description: | Six group portraits of men in human pyramid formations using ladders and one group portrait of men posing as a group at the 30th National Turnerfest in Cin... |
Date: | 11 24 1965 |
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Description: | University of Wisconsin Mathematics Professor Donald W. Crowe explaining a math problem on how to cut up a rectangular cake into equal size acute triangles... |
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