Young, Frederick H.
The nature of mathematics
John Wiley & Sons, 1968
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Craig, Robert T.
Modern principles of mathematics
Prentice-Hall, 1969
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Hafstrom, John E.
Basic concepts in modern mathematics
Addison-Wesely, 1961
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Sharp, Henry
Modern fundamentals of mathematics
Prentice-Hall, 1968
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Keedy, Mervin J.
A Modern introduction to basic mathematics
Addison-Wesley , 1969
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