521. IOR/L/PWD/7/11 Reference (shelfmark): IOR/L/PWD/7/11 Title: A.4 General Telegraph: (Introduction of 10 word messages with single word increment) Collection Area: India Office Records and Private Papers Languages: English Date Range: 1874 Extent: 1 volume
522. IOR/L/PWD/7/227 Reference (shelfmark): IOR/L/PWD/7/227 Title: D.3 Persian Gulf, Submarine and Mekran Lines: Periodical and Special Returns Collection Area: India Office Records and Private Papers Languages: English Date Range: 1866-1867 Extent: 1 volume
523. IOR/L/PWD/7/228 Reference (shelfmark): IOR/L/PWD/7/228 Title: D.3 Persian Gulf, Submarine and Mekran Lines: Periodical and Special Returns Collection Area: India Office Records and Private Papers Languages: English Date Range: 1869 Extent: 1 volume
524. IOR/L/PWD/7/229 Reference (shelfmark): IOR/L/PWD/7/229 Title: D.3 Persian Gulf, Submarine and Mekran Lines: Periodical and Special Returns Collection Area: India Office Records and Private Papers Languages: English Date Range: 1870 Extent: 1 volume
525. IOR/L/PWD/7/230 Reference (shelfmark): IOR/L/PWD/7/230 Title: D.3 Persian Gulf, Submarine and Mekran Lines: Periodical and Special Returns Collection Area: India Office Records and Private Papers Languages: English Date Range: 1871 Extent: 1 volume
526. IOR/L/PWD/7/231 Reference (shelfmark): IOR/L/PWD/7/231 Title: D.3 Persian Gulf, Submarine and Mekran Lines: Periodical and Special Returns Collection Area: India Office Records and Private Papers Languages: English Date Range: 1872 Extent: 1 volume
527. IOR/L/PWD/7/232 Reference (shelfmark): IOR/L/PWD/7/232 Title: D.3 Persian Gulf, Submarine and Mekran Lines: Periodical and Special Returns Collection Area: India Office Records and Private Papers Languages: English Date Range: 1873 Extent: 1 volume
528. IOR/L/PWD/7/233 Reference (shelfmark): IOR/L/PWD/7/233 Title: D.3 Persian Gulf, Submarine and Mekran Lines: Periodical and Special Returns Collection Area: India Office Records and Private Papers Languages: English Date Range: 1874 Extent: 1 volume
529. IOR/L/PWD/7/235 Reference (shelfmark): IOR/L/PWD/7/235 Title: D.3 Persian Gulf, Submarine and Mekran Lines: Periodical and Special Returns Collection Area: India Office Records and Private Papers Languages: English Date Range: 1876 Extent: 1 volume
530. IOR/L/PWD/7/236 Reference (shelfmark): IOR/L/PWD/7/236 Title: D.3 Persian Gulf, Submarine and Mekran Lines: Periodical and Special Returns Collection Area: India Office Records and Private Papers Languages: English Date Range: 1877 Extent: 1 volume