Greenwood, Robert E., papers
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- Winter day, early winter, [left to right] Robert Greenwood, Otto Haas, Joseph Daly
- Winter day, early winter, [left to right] Robert Greenwood, Otto Haas, Joseph Daly, Robert E. Greenwood papers, 4RM133, Personal: scrapbooks: scrapbook materials (1/3), Archives of American Mathematics, The University of Texas History