Al-Numa A. The Effect of Some Economic Variables in the Agricultural Value Added: A Sample of Arab Countries for Period 1980 – 2002 (Egypt, Syria and Algeria). TANRA [Internet]. 2009 Dec. 1 [cited 2025 Dec. 4];31(96):204-21. Available from: https://tanmiyat.uomosul.edu.iq/index.php/tanmiyat/article/view/30023