Limited (search only) 1975:Aug.,Nov.-Dec.
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University of Illinois at Urbana-Champaign
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Limited (search only) 1976 July-Dec.
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University of Illinois at Urbana-Champaign
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Limited (search only) 1976:Jan.-June
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University of Illinois at Urbana-Champaign
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Limited (search only) 1976:Jan.
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University of Illinois at Urbana-Champaign
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Limited (search only) 1977:July-Dec.
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University of Illinois at Urbana-Champaign
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Limited (search only) 1977:Jan.-June
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University of Illinois at Urbana-Champaign
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Limited (search only) 1978:July-Dec.
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University of Illinois at Urbana-Champaign
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Limited (search only) 1978:Jan.-June
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University of Illinois at Urbana-Champaign
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Limited (search only) 1979:Jan.-June
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University of Illinois at Urbana-Champaign
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Limited (search only) 1979:June-Dec.
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University of Illinois at Urbana-Champaign
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Limited (search only) 1980-1984
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University of Illinois at Urbana-Champaign
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Limited (search only) 1980:Feb.-June
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Cornell University
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Limited (search only) 1980:July-Dec.
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Cornell University
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Limited (search only) 1981:July-Dec.
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Cornell University
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Limited (search only) 1981:Jan.-June
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Cornell University
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Limited (search only) 1982-1983
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Cornell University
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Limited (search only) 1984-1985
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Cornell University
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Limited (search only) 1985-91(Inc.)
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University of Illinois at Urbana-Champaign
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Limited (search only) 1986
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Cornell University
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Limited (search only) 1992-93:MR
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University of Illinois at Urbana-Champaign
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