TY  - BOOK
AU  - Nieumenkamp,W.
TI  -      Stereograms for the determination of plagioclase feldspars in random sections
U1  - 549.68 NIE  
PY  - 1966///.
CY  - Amsterdam : 
PB  - Elsevier Publishing Company, 
KW  - Mineralogy
KW  - Feldspar
ER  -