1. IOR/V/27/761/17 Reference (shelfmark): IOR/V/27/761/17 Title: Schwendler, Louis, Instructions for testing telegraph lines and the technical arrangements of offices 2nd edition: Vol 2. London: Trubner, 1878-1880 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1878-1880 Extent: 1 volume