TY  - BOOK
AU  - Glasson K R
AU  -  Mcdonnell K S
TI  - Graded exercises in geological mapping
U1  - H2(U181), K8;2 
PY  - 1968///
CY  - London
PB  - Ginn         
KW  -  Petrology
KW  - Geology
ER  -