Annual, 1984-; Biennial; Vol. 12-; Vols. for 1978- cover statistical and analytical data through 1976-; Prepared by North Carolina Utilities Commission. Finance, Statistics, Budget & Planning Division.
"December 15, 2010."; Includes bibliographical references (p. 100-104).; Final report;; Performed by Department of Civil, Construction, & Environmental Engineering, NCSU, sponsored by NC Department of Transportation, Research and Analysis Group