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2
-
Sampling techniques / William G. Cochran.
- 519.52 C6631 1977
- Cochran, William G. 1909-1980,
- John Wiley & Sons,
- New-York :
-
Survey methods in social investigation / by C.A. Moser and G. Kalton.
- 300.723 M899 1971
- Moser, Claus, 1922-
- Heinemann Educational,
- London :