Robert D. Hackworth
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Elementary algebra
Hackworth, Robert D
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Algebra Programmed: Part 1
Alwin, Robert H.; Hackworth, Robert D.
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Math Anxiety Reduction
Hackworth, Robert D.
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Introductory College Mathematics
Hackworth, Robert D.
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Mathematical systems;: Finite and infinite
Hackworth, Robert D
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Programmed Arithmetic
Hackworth, Robert D.; Alwin, Robert H.; Howland, Joseph W.
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Focus on Developmental Mathematics
Hackworth, Robert; Howland, Joseph; Alwin, Robert H.
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