TY  - BOOK
AU  - Duffy, Gerald G.
AU  - Sherman, George B.,;Roehler, Laura R.,
ED  - 
ED  - 
ED  - 
ED  - 
SN  - 60417846
SN  - 2
PY  - 1977///];copyright 1977.46
CY  - New York
PB  - Harper & Row
KW  - 
KW  - 2
KW  - 0
KW  - 6
KW  - 20
KW  - Reading
N1  - Includes bibliographies; 5
ER  -