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Taiwo, O.P., Nwonuala, A.I. and I. B., F. 2020. Variability in Yield and Yield Components of Selected Pro-vitamin A Maize (Zea mays L.) Varieties in a Humid Environment of Port Harcourt, Nigeria. Asian Journal of Agricultural and Horticultural Research. 5, 3 (Mar. 2020), 1-10. DOI:https://doi.org/10.9734/ajahr/2020/v5i330051.