21. IOR/V/19/228 Reference (shelfmark): IOR/V/19/228 Title: Survey of India Professional Paper No. 21, Irrigation and settlement surveys 1926. J.D. Campbell. Dehra Dun, 1927 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1927 Extent: 1 volume
22. IOR/V/19/229 Reference (shelfmark): IOR/V/19/229 Title: Survey of India Professional Paper No. 22, Three sources of error in precise levelling. G. Bomford. Dehra Dun, 1928 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1928 Extent: 1 volume
23. IOR/V/19/230 Reference (shelfmark): IOR/V/19/230 Title: Survey of India Professional Paper No. 23, Air-survey of Waziristan 1923-1928. G.F. Heaney. Dehra Dun, 1928 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1928 Extent: 1 volume
24. IOR/V/19/231 Reference (shelfmark): IOR/V/19/231 Title: Survey of India Professional Paper No. 24, Notes on air survey in India. W.J. Norman. Dehra Dun, 1929 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1929 Extent: 1 volume
25. IOR/V/19/232 Reference (shelfmark): IOR/V/19/232 Title: Survey of India Professional Paper No. 25, The representation of glaciated regions on maps of the Survey of India. K. Mason. Dehra Dun, 1929 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1929 Extent: 1 volume
26. IOR/V/19/233 Reference (shelfmark): IOR/V/19/233 Title: Survey of India Professional Paper No. 26, Mount Everest and its Tibetan names: a review of Sir Sven Hedin's book. Sir Sidney Burrard. Dehra Dun, 1931 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1931 Extent: 1 volume
27. IOR/V/19/234 Reference (shelfmark): IOR/V/19/234 Title: Survey of India Professional Paper No. 27, Gravity anomalies and the structure of the earth's crust. E.A. Glennie. Dehra Dun, 1932 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1932 Extent: 1 volume
28. IOR/V/19/235 Reference (shelfmark): IOR/V/19/235 Title: Survey of India Professional Paper No. 28, The readjustment of the Indian triangulation. G. Bomford. Dehra Dun, 1939 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1939 Extent: 1 volume
29. IOR/V/19/236 Reference (shelfmark): IOR/V/19/236 Title: Survey of India Professional Paper No. 29, Magnetic anomalies. B.L. Gulatee. Dehra Dun, 1938 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1938 Extent: 1 volume
30. IOR/V/19/237 Reference (shelfmark): IOR/V/19/237 Title: Survey of India Professional Paper No. 30, Gravity anomalies and the figure of the earth. B.L. Gulatee. Dehra Dun, 1940 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1940 Extent: 1 volume