TY  - BOOK
TI  - The world book encyclopedia (vol-21): W-X-Y-Z
T2  - 21
U1  - 503 
CY  - London / Chicago / Sydney
PB  - World Book Incorporation
KW  - General Book (World Book)
KW  - Science -- Encyclopedias
N1  - Gift; encyclopaedia, science reference, world book
ER  -