TY  - RPRT
TI  - Mineral investigations in the Bir Al Bayda-Al 'Ula area Saudi Arabia
AU  - Virgil A. Trent
PY  - 1970
DO  - 10.3133/ofr70328
UR  - https://pubs.usgs.gov/publication/ofr70328
ID  - ofr70328
ER  -