TY  - BOOK
AU  - WINCHELL, Alexander N.
AU  - WINCHELL, Horace
TI  - ELEMENTS OF OPTICAL MINERALOGY: AN INTRODUCTION TO MICROSCOPIC PETROGRAPHY
U1  - 553.125 
PY  - 1964///
CY  - Kottayam
PB  - D.C.Books, Kottayam 
ER  -