TY  - BOOK
AU  - Winchell,Alexander N.
TI  - Elements of optical mineralogy : : An Introduction to microscopic petrography / 
U1  - 549.125 WIN  22nd ed. 
PY  - 1951///.
CY  - New Delhi : 
PB  - Wiley Eastern Private Limited, 
KW  - Mineralogy
KW  - Optical
ER  -