"id","author_first1","author_last1","title","year","publisher","place","keyword0","keyword1","keyword2","keyword3","keyword4","type" "721","R.J.","Gavin","Aden Under British Rule, 1839-1967","1975","C. Hurst and Co.","London","Aden","Aden Protectorate","Commerce","History","Ottoman-Britain","book"