TY  - RPRT
TI  - Petrology and mineralogy of alkaline rocks from the Elk massif, northeastern Poland
AU  - T.J. Armbrustmacher
AU  - P.J. Modreski
PY  - 1994
DO  - 10.3133/ofr94145
UR  - https://pubs.usgs.gov/publication/ofr94145
ID  - ofr94145
ER  -