by Zyl, H.J. van, Hartman, J.P
Published in Acta horticulturae (01.10.1993)

by Van Zyl, J.E., Ilemobade, A.A., Van Zyl, H.J.
Published in Water S. A. (01.07.2008)

by Ilemobade, A.A., Van Zyl, J.E., Van Zyl, H.J.
Published in Integrating Water Systems (2010)

by Zyl H.J. van, Hartman J.P
Published in Acta Horticulturae (Netherlands). no. 347 (1993)

by Zyl, H.J. van
Published in Deciduous Fruit Grower (1972)

by Zyl H.J. van, Strydom D.K
Published in Acta Horticulturae (Netherlands). no. 124 (1982)

by Hurter, N, Van Zyl, H.J
Published in Deciduous fruit grower. = Die Sagtevrugteboer (1979)

by Van Zyl, H.J, Olivier, J.M
Published in South African journal of plant and soil (1987)

by Van Zyl, H.J
Published in Deciduous fruit grower. = Die Sagtevrugteboer (1982)

by Van Zyl, H.J
Published in Deciduous fruit grower = Die Sagtevrugteboer (1981)

by Zyl, H.J. van (Fruit and Fruit Technology Research Inst., Stellenbosch (South Africa)), Wagner, J.W
Published in Acta Horticulturae (Netherlands) (1986)

by Stassen, P.J.C, Zyl, H.J. van
Published in Deciduous fruit grower = Die Sagtevrugteboer (1982)

by Tormann, H, Van Zyl, H.J
Published in Deciduous fruit grower = Die Sagtevrugteboer (1982)

by Van Zyl, H.J, Etsebeth, J.W
Published in Deciduous fruit grower = Die Sagtevrugteboer (1982)

by Van Zyl, H.J, Etsebeth, J.W
Published in Deciduous fruit grower = Die Sagtevrugteboer (1981)

by North, M, Van Zyl, H.J
Published in Deciduous fruit grower. = Die Sagtevrugteboer (1981)

by Kruger, T.F., vander Merwe, J.P., Stander, F.S.H., Menkveld, R., van den Heever, A.D., Kopper, K., Odendaal, H.J., van Zyl, J.A. & Villiers, J.N.
Published in South African medical journal (01.03.1986)

by Van Zyl, H.J, Strydom, D.K
Published in Frutticoltura (1974)

by Combrink, J.C, Eksteen, G.J, Van Zyl, H.J
Published in Deciduous fruit grower = Die Sagtevrugteboer (1983)