TY  - BOOK
AU  - Horn, Mary
TI  - Children and plastics stages 1,2 and stages 1, 2 and background: a unit for teachers
SN  - SCIENCE 5 13
U1  - 507 13 SCI 
PY  - 1974///
CY  - London
PB  -  Macdonald
KW  - SCIENCE
ER  -