TY  - BOOK
AU  - Cochran W G
TI  - Modern methods in the sampling of human populations: general prihciples in the selection of a sample
U1  - 000SA.5 
KW  - Human populations
KW  - Sampling
N1  - Reprint from the American Journal of Public Health ; v.41, no.6; June 1951 ; p.647-653
ER  -