TY  - BOOK
AU  - Harker , Alfred
TI  - Petrology for students
SN  - 521 05211 4
U1  - 552 
PY  - 1986///
CY  - Cambridge
PB  - Cambridge University Press
KW  - Petrology -
N1  - 1st ed. 1895, reprinted 1968
ER  -