Gwyer, G.D. Perennial crop supply response : the case of Tanzanian sisal / G.D. Gwyer - Ashford, Kent. : Wye College Press, 1971. - vii, 46 p. : ill. ; 24 cm. - Agrarian development studies reports ; 3 . Includes bibliographical references. Subjects--Topical Terms: Sisal industry--Tanzania. Dewey Class. No.: 339.1739678