by Markwardt, E.D
Published in Proceedings of the ... annual meeting (1974)

by Rehkugler, G.E, Markwardt, E.D
Published in Amer Soc Agr Eng Trans ASAE (1971)

by Rehkugler G.E, Millier W.F, Markwardt E.D
Published in New York's Food and Life Sciences Quarterly (1981)

by Sieczka, J.B, Ewing, E.E, Markwardt, E.D
Published in American potato journal (01.01.1986)

by Rehkugler G.E, Cummins J.N, Markwardt E.D
Published in Journal of the American Society for Horticultural Science (1979)