For anyone who might be interested, I finally obtained a copy of Banasik's "Embattled Arkansas: The Prairie Grove Campaign of 1862."
Regarding the 38th Arkansas Infantry regiment, it was commanded by Lt. Col. William Adams at Prairie Grove. Banasik states that Adams regiment consisted of 5 companies, citing Col. Bob Shaver's report on the battle. So, having reviewed the regimental rosters on-line, it appears from the transcripts that parts of Companies A, C, G, H, and probably K fought in the Battle of Prairie Grove. I say "parts" of these companies, because Banasik further states that Col. Adams had only 152 men in his command at the battle. If you look at the individual company rosters, 152 men would easily comprise just one company (I think I counted 158 names on the Company A roster. So, the attrition rate must have been excessive.