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2
-
Sampling techniques / William G. Cochran.
- 519.52 C6631 1963
- Cochran, William G. 1909-1980,
- John Wiley & Sons, Inc.,
- New York :
-
Foundations of epidemiology / Abraham M. Lilienfeld, David E. Lilienfeld.
- 614.4 L728 1980
- Lilienfeld, Abraham M.,
- Oxford University Press,
- New York :