Elhassan, Dr. Ardelshifa Mohammed. “Chromium Combination Tannage of Rural and Minimal Tanned Crusts”. JOURNAL OF ADVANCES IN BIOLOGY 9, no. 2 (May 20, 2016): 1816–1824. Accessed December 4, 2024. https://rajpub.com/index.php/jab/article/view/4015.