TY  - GEN
AU  - Parten Mildred Bernice
TI  - Surveys, polls, and samples: practical procedures 
AV  - HN29  
U1  - 307.2 
PY  - 1950///
CY  - New York
PB  - Harper
KW  - Social surveys
N1  - Bibliography: p. 537-602
ER  -