Bryan,
I feel certain you have already accessed the Ras Stirman letters held at The University of Arkansas, and also on sale as "In Fine Spirits" by the Washington County Historical Society.

http://libinfo.uark.edu/SpecialCollections/findingaids/davidsonaid.html

https://secure.gcmcomputers.com/washcohistoricalsociety/catalog/product_info.php?products_id=43