TY  - RPRT
TI  - A summary of niobium and rare earth localities from Ha'il and other areas in western Saudi Arabia: a preliminary study
AU  - John J. Matzko
AU  - Mohammed Ibne Naqvi
PY  - 1978
DO  - 10.3133/ofr78773
UR  - https://pubs.usgs.gov/publication/ofr78773
ID  - ofr78773
ER  -