NASHVILLE, Tenn. (AP) - Six Tennessee sites have been added to the National Register of Historic Places.

The Register is the nation's official list of cultural resources worthy of preservation.

The new sites in Tennessee are: the Grand Guitar in Bristol, the Tennessee Supreme Court Building in Nashville, Mead and Ross Marble Quarries in Knox County, the Martin-Dobyns House in Kingsport and the Blountville Historic District.

The Tennessee Historical Commission administers the program in Tennessee.

The district was listed in the Register in 1972. The revised nomination includes clarification of the areas of significance noted in the first nomination.