501. IOR/V/25/740 Reference (shelfmark): IOR/V/25/740 Title: Electricity Collection Area: India Office Records and Private Papers Languages: English Date Range: 1915-1950 Extent: 14 volumes
502. IOR/V/25/750 Reference (shelfmark): IOR/V/25/750 Title: Marine: General Collection Area: India Office Records and Private Papers Languages: English Date Range: 1877-1940 Extent: 18 volumes
503. IOR/V/25/752 Reference (shelfmark): IOR/V/25/752 Title: Marine: Lights and Lighthouses Collection Area: India Office Records and Private Papers Languages: English Date Range: 1876-1958 Extent: 59 volumes
504. IOR/V/25/760 Reference (shelfmark): IOR/V/25/760 Title: Posts and Telegraphs Collection Area: India Office Records and Private Papers Languages: English Date Range: 1875-1956 Extent: 98 volumes
505. IOR/V/25/800 Reference (shelfmark): IOR/V/25/800 Title: Social and Economic Conditions: General Collection Area: India Office Records and Private Papers Languages: English Date Range: 1922-1958 Extent: 29 volumes
506. IOR/V/25/801 Reference (shelfmark): IOR/V/25/801 Title: Standard of Living and Prices Collection Area: India Office Records and Private Papers Languages: English Date Range: 1924-1952 Extent: 3 volumes
507. IOR/V/25/810 Reference (shelfmark): IOR/V/25/810 Title: Population Collection Area: India Office Records and Private Papers Languages: English Date Range: 1940-1940 Extent: 1 volume
508. IOR/V/25/840 Reference (shelfmark): IOR/V/25/840 Title: Public Health: General Collection Area: India Office Records and Private Papers Languages: English Date Range: 1865-1944 Extent: 77 volumes
509. IOR/V/25/844 Reference (shelfmark): IOR/V/25/844 Title: Pilgrimages Collection Area: India Office Records and Private Papers Languages: English Date Range: 1933-1939 Extent: 2 volumes
510. IOR/V/25/850 Reference (shelfmark): IOR/V/25/850 Title: Disease and Medicine Collection Area: India Office Records and Private Papers Languages: English Date Range: 1885-1950 Extent: 98 volumes