TY  - BOOK
AU  - Green,Robert T.
AU  - Laxon,Veronica J.
TI  - Entering the world of number
SN  - 0500011966
PY  - 1978///]
CY  - [London]
PB  - Thames & Hudson
KW  - Mathematics
KW  - Study and teaching (Preschool)
N1  - Includes index; Bibliography: p. 177
ER  -