Raamatud R. G. Worl

Reconnaissance investigations of ancient gold mines in the southern part of the Wadi Bidah District, Jabal Ibrahim and Al Aqiq quadrangles, Kingdom of Saudi Arabia: USGS Open-File Report 82-789

R. G. Worl, C. W. Smih

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Reconnaissance geology of the Jabal al Hajrah 7.5-minute Quadrangle, Kingdom of Saudi Arabia: USGS Open-File Report 81-1218

R. G. Worl

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