Schaaf, William L.
Basic concepts of elementary mathematics /William L. Schaaf
Wiley-Academy, 1965
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Hafstrom, John E.
Basic concepts in modern mathematics
Addison-Wesely, 1961
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Gemignani, Michael C.
Basic concepts of mathematics logic
Addison-Wesley, 1968
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Devine, Donald F.
Elementary mathematics
John Wiley & Sons, 1977
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Paige, Donald D.
Elementary mathematics
Prindle, Weber & Schmidt, 1969
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