TY  - BOOK
ED  -  The Open University
TI  -  Block 7, the earth's origin and evolution
SN  -  0335160565
U1  -  550 
PY  - 1981///, repr. 1990
CY  -  Walton Hall : 
PB  -  The Open University , 
KW  -  Earth
KW  -  Origin
ER  -