There is an abundance of material available on this regiment.

Here is an excellent web site for this regiment. Contacts there may be able to help you further.
http://www.43nc.com/

"Sketch of the Duplin Rifles" http://ftp.rootsweb.com/pub/usgenweb/nc/duplin/misc/rifles01.txt

"The Civil War letters of W.D. Carr of Duplin County, North Carolina" : with additional notes on his family and the campaigns in which he served / compiled and edited by Robert and Elsie J. Aycock

http://history-sites.net/mb/cw/nccwmb/index.cgi?read=705
43rd Infantry Regt., NC Posted By: L. K. Shuffield Date: Thursday, 23 November 2006, at 6:
In reading the newspaper, "Weekly Ansonian" Vol. III, No. 1 through 18, dated beginning Wed., 12 Apr 1876 through 2 Aug 1876, I found on p. 1 of each issue a running series on the history of the 43rd NC Regiment ... most articles were 1 to 2 full colums in length ...
I am sure the series continues on the next reel of newspapers on micorfilm for this publication but I have to order it via ILL to make sure ....
So, anyone interested in a long-running detailed first-hand narrative account of the history of this unit during The War, will make use of this recommendation ...

http://statelibrary.dcr.state.nc.us/tss/newspape.htm#Now

http://www.navarrocollege.edu/library/civilwar/finding_aids/a_f/brown.htm

.....Brown's 1862 letters include descriptions of the misconduct of married soldiers, his religious beliefs, Fort Johnson (near Smithville, North Carolina) and the Union blockades in the distance, and his troubles with his commission. Of note is Brown's July 4, 1862 letter written shortly after the Seven Days' Campaign. In this letter Brown described the horrifying aftermath of battle when "blood flowed like water." On November 12, 1862 Brown wrote to E.G. Gaillard, Medical Director declining his commission and requesting a leave of absence. On the verso of this letter is Brigadier General Junius Daniel's endorsement of Brown's leave of absence and Gaillard's refusal of Brown's leave of absence. Brown's letter of January 13, 1863 describes Brown's hopes to receive a surgeon's certificate of disability so he could resign from the Army and return home......

http://www.rootsweb.com/~ncduplin/duplinrifles.htm