TY  - BOOK
AU  - Langbein,Laura Irwin
AU  - Lichtman,Allan J.
TI  - Ecological inference / 
SN  - 0803909411
U1  - 300.182 
PY  - 1978///
CY  - Newbury Park : 
PB  - Sage Publishing, 
KW  - Social sciences
KW  - Statistical methods
N1  -  Includes bibliographical references
ER  -