by Sewell, W.D
Published in Northeast Weed Contr Conf Proc (1970)

by Sewell W.D
Published in Agricultural aviation: the world of agricultural aviation (1983)

by Womble, B.A. (Valent U.S.A. Corporation, Memphis, TN), Rich, G.J, Sewell, W.D
Published in Proceedings of the Beltwide Cotton Production Conference (USA) (1990)

by Sewell, W.D. (New Zealand Forest Products Ltd., Tokoroa (New Zealand))
Published in Uppsatser och Resultat - Sveriges Lantbruksuniversitet, Institutionen foer Skogsteknik (Sweden) (1987)

by Murphy, H.J, Goven, M.J, Sewell, W.D
Published in Amer Potato J (1970)