TY  - GEN
AU  - Schumann , Walter
AU  - Bradshaw , R. 
AU  - Mills , K.A.G. 
TI  - Collins photo guide to rocks, minerals and gemstones
SN  - 0002199092
U1  - 550 
PY  - 1985///
CY  - London
PB  - Harper Collins
KW  - Earth Sciences
ER  -