TY  - BOOK
AU  - Hess Irene
AU  - Fitzapatrick T B
AU  - Riedel D C
TI  - Probability sampling of hospitals and patients
U1  - 000SB:362.11(73) 
PY  - 1961///
CY  - Ann Arbor
PB  - Michigan Univ
KW  - Hospital
KW  - Patients
KW  - Probability sampling
ER  -