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by Paul D. Kimmel (University of Wisconsin, Milwaukee ); Jerry J. Weygandt (University of Wisconsin, Mad ); Donald E. Kieso (Northern Illinois University )
by Meggie Mapes, University of Kansas
by University of Illinois Extension
by Wright State University
by Howard Anton (Drexel University); Irl C. Bivens; Stephen Davis (Davidson College)
by University of Chicago School Mathematics Project; Flanders, James; Lassak, Marshall; et al.
by Michael D. Oates (University of Northern Iowa); Jacques Dubois (University of Northern Iowa)
by Siri Carpenter (Yale University ); Karen Huffman (Palomar College)
by Florida Atlantic University Dept. of Chemistry