TY  - BOOK
AU  - Williams A
TI  - Correlation of ordovician rocks in the British Isles
T2  - Geological society of london, special report; 3
U1  - H522.56.C4, L6 
PY  - 1976///
CY  - London
PB  - Scottish Academic        
KW  -  Ordovician
KW  - Geology
ER  -