TY  - BOOK
AU  - Richards,Roy
ED  - Macdonald & Co.
TI  - Holes, gaps and cavities: a unit for teachers : stage 1 and 2
T2  - Science
SN  - 0356035549
U1  - 372.35 23
PY  - 1970///.
CY  - London : 
PB  - Macdonald & Co
KW  - Science
KW  - Study and teaching (Elementary)
ER  -