2025. Combined Effect of Polypropylene Fiber and Nano Calcium Carbonate to Improve Compressed Earth Blocks Produced from Clayey Soil, Kirkuk City, Iraq. Iraqi National Journal of Earth Science (INJES). 25, 3 (Jul. 2025), 29–49. DOI:https://doi.org/10.33899/earth.2024.148494.1262.