Marty, have you tried the Military Records Research Service site, associated with this board? Click on the big white banner at the top of this page. This will put you in touch with Alan Pitts, who should be able to help you out.

Regarding Dawson's 19th Arkansas Regiment, Doyle Taylor has posted some interesting information on this board in the past, discussing how recruits for Dawson's regiment were "shanghaied" and farmed out to other regiments. Maybe he'll throw in here and discuss it at more length.