TY  - BOOK
AU  - Winchell,Alexander Newton
AU  - Winchell,N.H.
TI  - Elements of optical mineralogy: an introduction to microscopic petrography 
U1  - 552 
PY  - 1968///
CY  - New York
PB  - John Wiley
KW  - Optical mineralogy
N1  - First and second editions by Newton H. Winchell and Alexander N. Winchell; Four folded diagrams in pocket; Includes index; pt. 2. Principles and methods
ER  -