1. IOR/V/27/420/74 Reference (shelfmark): IOR/V/27/420/74 Title: India. Survey of India, Trigonometrical Branch Spirit-Levelled heights: Nos 1-3: Bombay Presidency 1874-80. Dehra Dun, 1863-1903 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1863-1903 Extent: 1 volume