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Gupta,C B
 An Introduction to statistical methods \ C B Gupta
- 7th rev and enl.
- Delhi : Vikas Publishing House, 1972.
 xvi, 107p.
  With Appendix, Logarithms
  ISBN: 7069-02165
81010
  Subjects: Statistics; Sampling (Statistics); Correlation (Statistics); Statistics-Graphic methods.