1. IOR/L/PS/12/4189 Reference (shelfmark): IOR/L/PS/12/4189 Title: Coll 36/23(2) Indo-Tibetan frontier: survey of India map "Highlands of Tibet and surrounding regions Collection Area: India Office Records and Private Papers Languages: English Date Range: 16 Jul 1936-16 Nov 1944 Extent: 1 file