For further reading on the North Carolina State Capitol and the Civil War:
Barrett, John G. Sherman's March through the Carolinas. Chapel Hill: University of North Carolina Press, 1956.
—. North Carolina as a Civil War Battleground, 1861-1865. Raleigh: N.C. Division of Archives and History, 1993.
Davis, Burke. Sherman's March. New York: Random House, 1980.
Harris, William C. North Carolina and the Coming of the Civil War. Raleigh: N.C. Division of Archives and History, 1992.
Murray, Elizabeth Reid. Wake County: Capital County of North Carolina. Vol. 1, Prehistory Through Centennial. Raleigh: Capital County Publishing Company, 1983.
Poteat, R. Matthew. Henry Toole Clark: Civil War Governor of North Carolina. Jefferson, NC: McFarland and Co. Publishing, 2009.
Sitterson, Joseph Carlyle. The Secession Movement in North Carolina. Chapel Hill: University of North Carolina Press, 1939.
Wise, Jim. Murder in the Courthouse: Reconstruction and Redemption in the North Carolina Piedmont. Charleston, SC: The History Press, 2010.
A general bibliography for the North Carolina State Capitol can be found at here. Most of these titles reference the architectural history of the Capitol.