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2020. The Performance of Two Species of Black Cumin (Nigella sativa L.) and (Nigella arvensis L.) Under Different Sowing Dates in Spring and Autumn at hallabja Governorate /Iraqi Kurdistan Region. Ibn AL-Haitham Journal For Pure and Applied Sciences. 33, 3 (Jul. 2020), 1–10. DOI:https://doi.org/10.30526/33.3.2465.