found: District gazetteers of Bolan, Chagai (microfiche ed.), 1906.
found: GEOnet, March 29, 2005(Bolān Pass; Pass, 29̊ 45ʹN and 67̊ 35ʹE, PK02; variant Bulan Pass)
found: Col. gazett., 1962(Bolan Pass - a district of Baluchistan. Bolan gap in Central Brahui Range, N.E. Central Baluchistan, West Pakistan. Historically an important "gateway" to India.)
found: Imp. gazett. India, 1972(Bolan Pass - a district of Baluchistan lying between 29̊ 24ʹ, 30̊ 10ʹN and 67̊ 4ʹ, 67̊ 44ʹE, with an area of 896 squire miles.)