21. IOR/L/PWD/3/234-242 Reference (shelfmark): IOR/L/PWD/3/234-242 Title: Railway and Telegraph Letters from Bombay Collection Area: India Office Records and Private Papers Languages: English Date Range: 1850-1879 Extent: 9 volumes
22. IOR/L/PWD/3/286-290 Reference (shelfmark): IOR/L/PWD/3/286-290 Title: Telegraph Letters and Enclosures from Bombay Collection Area: India Office Records and Private Papers Languages: English Date Range: 1864-1871 Extent: 5 volumes
23. IOR/L/PWD/3/291-294 Reference (shelfmark): IOR/L/PWD/3/291-294 Title: Public Works Despatches to India (Copies) Collection Area: India Office Records and Private Papers Languages: English Date Range: 1860-1879 Extent: 4 volumes
24. IOR/L/PWD/3/504-505 Reference (shelfmark): IOR/L/PWD/3/504-505 Title: Public Works Despatches to Madras (Copies) Collection Area: India Office Records and Private Papers Languages: English Date Range: 1860-1880 Extent: 2 volumes
25. IOR/L/PWD/3/547-548 Reference (shelfmark): IOR/L/PWD/3/547-548 Title: Railway Despatches to Madras (Original Drafts) Collection Area: India Office Records and Private Papers Languages: English Date Range: 1858-1879 Extent: 2 volumes
26. IOR/L/PWD/3/549-550 Reference (shelfmark): IOR/L/PWD/3/549-550 Title: Public Works Despatches to Bombay (Copies) Collection Area: India Office Records and Private Papers Languages: English Date Range: 1860-1880 Extent: 2 volumes
27. IOR/L/PWD/3/586-590 Reference (shelfmark): IOR/L/PWD/3/586-590 Title: Railway Despatches to Bombay (Original Drafts) Collection Area: India Office Records and Private Papers Languages: English Date Range: 1858-1879 Extent: 5 volumes
28. IOR/L/PWD/6/1-31 Reference (shelfmark): IOR/L/PWD/6/1-31 Title: Public Works Department (Home) Papers Collection Area: India Office Records and Private Papers Languages: English Date Range: 1880-1881 Extent: 31 volumes
29. IOR/L/PWD/6/32-77 Reference (shelfmark): IOR/L/PWD/6/32-77 Title: Public Works Department (India) Papers Collection Area: India Office Records and Private Papers Languages: English Date Range: 1880-1881 Extent: 46 volumes
30. IOR/L/PWD/7/1933-1960 Reference (shelfmark): IOR/L/PWD/7/1933-1960 Title: Notifications: Bureau International des Administrations Telegraphiques/Union Telegraphique, Berne Collection Area: India Office Records and Private Papers Languages: English Date Range: 1903-1930 Extent: 28 volumes