21. IOR/V/20/161 Reference (shelfmark): IOR/V/20/161 Title: Records of the Geological Survey of India, Vols 49-50 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1918-1919 Extent: 1 volume
22. IOR/V/20/162 Reference (shelfmark): IOR/V/20/162 Title: Records of the Geological Survey of India, Vols 51-52 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1920-1921 Extent: 1 volume
23. IOR/V/20/163 Reference (shelfmark): IOR/V/20/163 Title: Records of the Geological Survey of India, Vol 53 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1921-1922 Extent: 1 volume
24. IOR/V/20/164 Reference (shelfmark): IOR/V/20/164 Title: Records of the Geological Survey of India, Vol 54 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1922 Extent: 1 volume
25. IOR/V/20/165 Reference (shelfmark): IOR/V/20/165 Title: Records of the Geological Survey of India, Vol 55 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1923-1924 Extent: 1 volume
26. IOR/V/20/166 Reference (shelfmark): IOR/V/20/166 Title: Records of the Geological Survey of India, Vols 56-57 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1924-1925 Extent: 1 volume
27. IOR/V/20/167 Reference (shelfmark): IOR/V/20/167 Title: Records of the Geological Survey of India, Vol 58 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1925-1926 Extent: 1 volume
28. IOR/V/20/168 Reference (shelfmark): IOR/V/20/168 Title: Records of the Geological Survey of India, Vol 59 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1926 Extent: 1 volume
29. IOR/V/20/169 Reference (shelfmark): IOR/V/20/169 Title: Records of the Geological Survey of India, Vol 60 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1927-1928 Extent: 1 volume
30. IOR/V/20/170 Reference (shelfmark): IOR/V/20/170 Title: Records of the Geological Survey of India, Vol 61 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1928-1929 Extent: 1 volume