Keedy, Mervin & Bittinger, Mervin

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  Measures, Ratio, and Averages
  by Keedy, Mervin & Bittinger, Mervin, Mervin Bittinger
  Softcover, Addison-Wesley, ISBN 0201039818 (0-201-03981-8)
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  Numbers of Ordinary Arithmetic and Algebra
  by Keedy, Mervin & Bittinger, Mervin, Mervin Bittinger
  Softcover, Addison-Wesley, ISBN 0201039826 (0-201-03982-6)
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  Operations of the Numbers of Arithmetic
  by Keedy, Mervin & Bittinger, Mervin, Mervin Bittinger
  Softcover, Addison-Wesley, ISBN 0201039796 (0-201-03979-6)