TY  - BOOK
AU  - Muir, Duncan
TI  - Knowledge masters: optical illusions 
SN  - 1903954614
AV  - QP 495 .M953 2003
U1  - HS 760 
PY  - 2003///.
CY  - London
PB  - Zigzag Childrens Books
KW  - Illusions
ER  -