1. IOR/V/27/420/116 Reference (shelfmark): IOR/V/27/420/116 Title: Hunter, J de Graaff, Note on a change of axes of the terrestrial spheroid in relation to the triangulation of the G.T. Survey of India. Dehra Dun, 1912 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1912 Extent: 1 volume