TY  - BOOK
AU  - MERTTENS, Ruth and KIRKBY, David
TI  - Abacus: Number Textbook 2
SN  - 9780602290979
U1  - 513.5 22nd edtion
PY  - 2004///
CY  - London
PB  - Ginn and Company
KW  - Mathematics
ER  -