Full view 1939:Dec.-1940
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University of Illinois at Urbana-Champaign
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Limited (search only) 1942
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Harvard University
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Limited (search only) 1942-1944
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University of Illinois at Urbana-Champaign
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Limited (search only) 1942-1945
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Cornell University
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Full view 1945-1947
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University of Illinois at Urbana-Champaign
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Limited (search only) 1946-1957
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Cornell University
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Limited (search only) 1948
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Harvard University
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Full view 1948-1952
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University of Illinois at Urbana-Champaign
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Limited (search only) 1949
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Harvard University
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Limited (search only) 1950
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Harvard University
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Limited (search only) 1951:Apr./1952:Mar.
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Harvard University
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Full view 1952-1955
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Cornell University
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Limited (search only) 1953-1955
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University of Illinois at Urbana-Champaign
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Limited (search only) 1956-1959
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University of Illinois at Urbana-Champaign
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Limited (search only) 1956/1959
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Cornell University
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Full view 1960-1961
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Cornell University
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Limited (search only) 1962-1964
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Cornell University
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Limited (search only) 1965-1969
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Cornell University
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Limited (search only) 1968-1970
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University of Illinois at Urbana-Champaign
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Full view 1970-1971
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Cornell University
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