Limited (search only) no.1-12
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Cornell University
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Limited (search only) no.1-15(1987-1990)
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University of Illinois at Urbana-Champaign
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Limited (search only) no.13-27 1990-93
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Cornell University
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University of Illinois at Urbana-Champaign
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Limited (search only) no.31(1995)
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University of Illinois at Urbana-Champaign
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University of Illinois at Urbana-Champaign
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University of Illinois at Urbana-Champaign
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Cornell University
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Cornell University
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