TY  - BOOK
AU  - Winchell,Alexander Newton
AU  - Winchell,N.H.
TI  - Elements of optical mineralogy: an introduction to microscopic petrography 
U1  - 549.1 
PY  - 1931///-<1951   >
CY  - New York, London
PB  - J. Wiley & sons, inc., Chapman & Hall, limited
KW  - Optical mineralogy
N1  - First and second editions by Newton H. Winchell and Alexander N. Winchell; Four folded diagrams in pocket; pt. I. Principles and methods
ER  -