1. IOR/L/PS/11/210, P 266/1922 Reference (shelfmark): IOR/L/PS/11/210, P 266/1922 Title: P 266/1922 Tibet: geological investigations of Sir H Hayden Collection Area: India Office Records and Private Papers Languages: English Date Range: 25 Jun 1921-29 Jun 1923 Extent: 1 file