Abstract: Memorandum detailing the classification of the Arabian tribes inhabiting Oman including history on how the tribes came to Oman, how they developed and how they became known as the Hinawi and Ghafiri tribes.The accompanying table to the memorandum is entitled 'Principal tribes of Omân - Hinâwî Division and Ghâfiri Division' and details the adjective, collective and plural forms of the tribes names; their religious sects; their province; their villages or districts; the number of males in the tribe; and any additional comments, which primarily relate to relations between tribes.Included in the file is a Map of Oman showing the distribution of the principal tribes which was compiled by Ross. Also included in the file is a genealogical table of 'the descendants of the Imâm Ahmed Âl-Bû-Sa'îdî', as documented by Ross.Physical description: Foliation: The file has been foliated using a pencil number enclosed in a circle in the top right corner of the recto of each folio.