The BLM now has a land patent search tool:

http://www.glorecords.blm.gov/PatentSearch/Wait.asp
posted by Lloyd at 7:37 AM

The ancestry.com Mississippi Court Records has wills and court records for Natchez, Hinds, and Yalobusha, plus cemetery inscriptions for several Hinds county locations.
posted by Lloyd at 7:17 AM

Kimball & James' business directory for the Mississippi Valley: 1844. :
Including the following places, Pittsburgh, Beaver, Steubenville, Wheeling, Portsmouth, Maysville, Cincinnati, Lawrenceburgh, Madison, Louisville, St. Louis, Memphis, Vicksburg, Natchez, New-Orleans. With a brief notice of the discovery and occupation of the Mississippi Valley, and a historical and statistical sketch of the principal cities above mentioned.
Author: Kimball, John F., Document: English :
posted by Lloyd at 7:11 AM

Promotional Wizardry: Rhetoric and Railroad Origins, 1820-1860
James A. Ward
Journal of the Early Republic, Vol. 11, No. 1 (Spring, 1991), pp. 69-88 (article consists of 20 pages)
Published by: University of Pennsylvania Press on behalf of the Society for Historians of the Early American Republic

posted by Lloyd at 9:37 PM

First of all, Google seems to have digitized Hunt's Merchants' Magazine.

I found interesting results looking for HMM, 1843 Natchez.

Mercantile Education in the Ante-Bellum South
Lewis E. Atherton
The Mississippi Valley Historical Review, Vol. 39, No. 4 (Mar., 1953), pp. 623-640 (article consists of 18 pages)
Published by: Organization of American Historians
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posted by Lloyd at 9:31 PM