1982 · Bhowmik, Nani G., Demissie, Misganaw, et al. · Illinois Digital Environment for Access to Learning and Scholarship (University of Illinois at Urbana-Champaign) · 20
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1977 · William H. Hallenbeck, Carolyn S. Hesse, et al. · Illinois Digital Environment for Access to Learning and Scholarship (University of Illinois at Urbana-Champaign) · 2