1. IOR/R/15/5/393/21 Reference (shelfmark): IOR/R/15/5/393/21 Title: India Office Political and Secret Department Confidential Memoranda: B 401 Lighting and Buoying of the Persian Gulf, 1908-1928, M. J. Clauson Collection Area: India Office Records and Private Papers Languages: English Date Range: Aug 1928 Extent: 6pp