TY  - BOOK
AU  - Debboys, Mary.
AU  - Pitt, Eunice.
TI  - Primary mathematics: lines of development 
SN  - 0856401943
U1  - 510.DEB 
PY  - 1979///
CY  - Galway Park
PB  - The Blackstaff press
KW  - Mathematics
KW  - Study and teaching (Elementary)
KW  - Great Britain
N1  - Include bibliography
ER  -