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 | 1977 | |
|---|---|---|
| 3 |      | William G. Cochran: Sampling Techniques, 3rd Edition. John Wiley 1977 |
| 1963 | ||
| 2 | | William G. Cochran: Sampling Techniques John Wiley 1963 |
| 1953 | ||
| 1 | | William G. Cochran: Sampling Techniques John Wiley 1953 |