. . . . . . . . . "US 321 improvements project from Blackberry Road to US 221 at Blowing Rock, Caldwell and Watauga Counties, North Carolina, state project no. 6.739001T, TIP no. R-2237C final environmental impact statement"@en . . . "Final environmental impact statement"@en . "US 321 improvements project from Blackberry Road to US 221 at Blowing Rock, Caldwell and Watauga Counties, North Carolina, state project no. 6.739001T, TIP no. R-2237C : final environmental impact statement"@en . . . . . . . . . "Parsons, Brinckerhoff, Quade & Douglas." . . "United States Highway 321" . .