Naga, M. A., F. H. Soliman, R. R. Shahin, and Y. A. Nasr,
"Clay mineralogy of some dry valleys in the eastern desert of Egypt",
Al Mağallat al-miṣriyyat li-'ulum al-aradi, vol. 25, no. 1: National Information and Documentation Centre, pp. 1–9, 1985.
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