TY  - RPRT
TI  - Exploration and evaluation of the Hajrah-Hamdah group of ancient gold mines, Kingdom of Saudi Arabia
AU  - A. M. Helaby
AU  - Ronald G. Worl
PY  - 1981
DO  - 10.3133/ofr81445
UR  - https://pubs.usgs.gov/publication/ofr81445
ID  - ofr81445
ER  -