TY  - GEN
TI  - 1991 Science year: the world book annual Science supplement , a review of science and technology during the 1990 school year
SN  - 0716605910
U1  - 500 
PY  - 1990///
CY  - Chicago
PB  - World Book. inc.
KW  - YEAR BOOK 1991
KW  - SCIENCE AND TECHNOLOGY
KW  - SCIENCE
KW  - WORLD ANNUAL SCIENCE SUPPLEMENT
ER  -