TY  - BOOK
AU  - Winchell,Alexander Newton
AU  - Winchell,N.H.
TI  - Elements of optical mineralogy: an introduction to microscopic petrography, 3v.; I. Principles and methods. 3d ed., rev. and enl.- pt. II. Descriptions of minerals. 4th ed.- pt. III. Determinative tables 
U1  - 549.1 
PY  - 1928///-39
CY  - New York
PB  - Wiley
KW  - Mineralogy, Determinative
KW  - Optical mineralogy
ER  -