TY  - BOOK
AU  - WINCHELL, ALEXANDER N
AU  - WINCHELL, HORACE
TI  - Elements of Optical Mineralogy: An Introduction to Microscopic Petrography
U1  - H1 
PY  - 1968///
CY  - New Delhi
PB  - willey eastern limited
KW  - MINERALOGY, DETERMINATIVE
ER  -