1. IOR/V/27/420/109 Reference (shelfmark): IOR/V/27/420/109 Title: India. Survey of India, Miscellaneous paper relating to the measurement of geodetic bases by J äderin Invar apparatus. Dehra Dun, 1912 Scope & Content: For departmental use only Collection Area: India Office Records and Private Papers Languages: English Date Range: 1912 Extent: 1 volume