J. Hall, A., ألن, A. Mohammad, H. and هيام 2025. Measurement of Quantitative Colour Values of Ore Minerals Using a Filter-Photocell Method. Iraqi National Journal of Earth Science (INJES). 12, 1 (Jun. 2025), 23–38. DOI:https://doi.org/10.33899/earth.2012.36135.