TY  - BOOK
AU  - Zeleny,Robert O.
TI  - Science year: the world book annual science supplement : 1990 
SN  - 0-7166-0590-2
U1  - Ref. 505 S416 1989 
PY  - 1989///
CY  - Illinois
PB  - World Book Inc.
KW  - Science -- Periodicals
N1  - Includes index
ER  -