TY  - BOOK
ED  -  The Open University.
TI  -  Block 1, earth compostion : :  elements, minerals and rocks
SN  -  0335160557
U1  -  551 
PY  - 1981///, repr. 1990
CY  -  Walton Hall : 
PB  -  The Open University Press, 
KW  -  Earth sciences
KW  -  Great Britain
KW  -  Geology
ER  -