121. IOR/V/27/420/48 Reference (shelfmark): IOR/V/27/420/48 Title: Thompson, C M, The tides (Part 5 of the Handbook of professional instructions for the Geodetic Branch, 3rd edition). Dehra Dun, 1926 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1926 Extent: 1 volume
122. IOR/V/27/420/124 Reference (shelfmark): IOR/V/27/420/124 Title: Hirst, F C and Smart, A B, A brief history of the surveys of the Goalpara District [with maps]. Shillong, 1917 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1917 Extent: 1 volume
123. 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