"id","author_first1","author_last1","title","year","publication","volume","issue","pages","author_first2","author_last2","keyword0","keyword1","type" "1320","John M.","Cohen","Capital-surplus, labor short economies: Yemen as a challenge to rural development strategies","1979","American Journal of Agricultural Economics","61","3","523-28","David B.","Lewis","Economy","Rural","journal"