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2
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Elementary statistical methods / Helen M. Walker, Joseph Lev.
- 311.2 W1772 1958
- Walker, Helen M. 1891-1983.
- Holt, Rinehart and Winston,
- c1958.
- New York :
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Mathematics essential for elementary statistics : a self-teaching manual / Helen M. Walker.
- 510 W1772 1951
- Walker, Helen M. 1891-1983.
- Holt,
- c1951.
- New York :