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by Stewart, Greg L.; Brown, Kenneth G.
by Hayford, Jack W.; Chappell, Paul G., Ph.D.; Ulmer, Kenneth C., Ph.D.; et al.
by Hayford, Jack W.; Chappell, Paul G., Ph.D.; Brown, Judy; et al.
by Brown, Kenneth G.
by Greg L. Stewart (University of Iowa); Kenneth G. Brown (University of Iowa )
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