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Heyd, David E. (Personal Name)
Larson, R. E. Calculus, with ... c1979 (a.e.) t.p. (David E. Heyd; Penn. State Univ., The Behrend Coll.)
U.S. copyright file, May 15, 2007 (Heyd, David E., 1943- )
Larson, R. E. Calculus, with ... c1979 (a.e.) t.p. (David E. Heyd; Penn. State Univ., The Behrend Coll.)
U.S. copyright file, May 15, 2007 (Heyd, David E., 1943- )