TY  - BOOK
AU  - Leff, Gordon.
AU  - 
ED  - 
ED  - 
ED  - 
ED  - 
SN  - 817366059
SN  - 2
PY  - 0000///46
CY  - 
PB  - 
KW  - 
KW  - 2
KW  - 0
KW  - 6
KW  - 20
KW  - Methodology.;Research
KW  - History;History
N1  - Bibliographical footnotes; 5
ER  -