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Ljungquist, Kent. "From Sublimity to Pictorialism: `Tamerlane,' `Al Aaraaf,' and Some Revisions in the Later Poetry." The Grand and the Fair: Poe's Landscape Aesthetics and Pictorial Techniques. 1984. GALE Resource Database. Site Accessed November 27, 200
Women in the Works of Hawthorne and Poe
Berthault, G. (2004) Sedimentological Interpretation of the Tonto Group Stratigraphy (Grand Canyon, Colorado River) Journal of Russian Academy of Science "Lithology and Mineral Resources" Vol.39. No.5, 2004.
The Cambrian System
Gibbons, Helen. "Grand Canyon Studies: Controlled Flood." 11 June 1998. 19 April 2004. < http://walrus.wr.usgs.gov/grandcan/flood.html >
Life of a Homesteader
Timmons, Mike et al (1999) Grand Canyon Supergroup Six Unconformities Make One Great Unconformity A Record of Supercontinent Assembly and Disassembly BQR ~ winter 1998-99 Online available at: http://gcrg.org/bqr/12-1/supergroup.html
The Cambrian System
Paleozoic Sedimentary Rocks of Grand Canyon, part 1, 2003, http://www.studyworksonline.com/cda/content/article/0,,EXP888_NAV2-77_SAR874,00.shtml
The Cambrian System
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