TY  - BOOK
TI  - I WONDER WHY ENCYCLOPEDIA / 
SN  - 753401088
U1  - R/J/503/ENC 
PY  - 1996///
KW  - SCIENCE
KW  - ENCYCLOPAEDIAS
KW  - ÙØ§Ø´Ø¦ÙÙ ÙØ¨Ø§Ø± ( 15  - 18 Ø³ÙØ© )
ER  -