1. IOR/V/27/420/47 Reference (shelfmark): IOR/V/27/420/47 Title: Bomford, G, Geodetic triangulation (Part 1 of the Handbook of professional instructions for the Geodetic Branch, 3rd edition). Dehra Dun, 1931 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1931 Extent: 1 volume