TY  - BOOK
AU  - Boccardo,Johanna
TI  - time
T2  - Britannica Discovery Library
SN  - 159339103x
U1  - 031 21
PY  - 2005///
CY  - Cairo
PB  - Dar El Shorouk
KW  - Mathimatics
KW  - الرياضيات
N1  - Abithmetic Notion
ER  -