Mineral exploration in the Wadi Bidah district, 1972-1976, Kingdom of Saudi Arabia - Kiilsgaard, Thor; Greenwood, W.R.; Puffet, W.P.; Naqvi, M.I.; Roberts, R.; Worl, R.; Merghelani, Habib; Flanigan, V.; Gazzaz, A.R. (Open-File Report, 1978)