| References: | Culyam-Ali-Khan (1948) The first summary report on beryl Darai-Sar and Derai-Nur deposits. Kabul, Rec. Off. DGMS, 1948; Gulyam-Ali-Khan (1949) The third report on the beryl Darai a Nur and Chapa-Dara deposits in the Eastern province. Kabul, Rec. Off, DMS, 1950. |