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2
-
Sampling techniques / William G. Cochran.
- 519.52 C6631 1977
- Cochran, William G. 1909-1980,
- John Wiley & Sons,
- New-York :
-
Planning and analysis of observational studies / William G. Cochran ; edited by Lincoln E. Moses and Frederick Mosteller.
- 519.57 C6631p
- Cochran, William G. 1909-1980,
- John Wiley & Sons,
- New York :