TY  - GEN
AU  - Yapp,
TI  - Production, pollution, protection
T2  - Wykeham science series
SN  - 0851092500 
PY  - 0000///Wykeham Publications
CY  - London
PB  - 1972
KW  - 013 y
KW  - D 61
KW  - D 75
ER  -