"id","author_first1","author_last1","title","year","publisher","place","author_first2","author_last2","keyword0","keyword1","keyword2","keyword3","keyword4","type" "797","F.P.M.","Van de Ven","The Impact of Emigration on the Agricultural Development of Yemen Arab Republic","1981","Rijksuniversiteit Utrech","Utrech","A.J.","Diphoorn","Agriculture","Change","Marketing","Migration","PDRY","book"