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2. Petrography and geology of the igneous rocks of the Highwood mountains, Montana;Pirsson;Bulletin,1905
3. The geology and petrography of Crater Lake National Park;Diller;Ser. Geol. Surv. Prof. Pap.,1902
4. Fundamentals of Soils;Gerrard,2000
5. The Chemistry of Soils;Sposito,2008