Mohammed, Sarwar Abdulla, and Saya Salam Sabir. “Geographical Analysis of Differences in Soil Chemical Properties in Sirwan District: ”. Halabja University Journal 8, no. 2 (June 30, 2023): 215–237. Accessed October 14, 2024. https://huj.uoh.edu.iq/index.php/HUJ/article/view/huj-10473.