7 C.F.R. § 30.37 – Class 2; fire-cured types and groups.

(a) Type 21. That kind of fire-cured tobacco commonly known as Virginia Fire-cured, or Dark-fired, produced principally in the Piedmont and mountain sections of Virginia.
(b) Type 22. That type of fire-cured tobacco, known as Eastern District Fire-cured, produced principally in a section east of the Tennessee River in southern Kentucky and northern Tennessee.
(c) Type 23. That type of fire-cured tobacco, known as Western District Fire-cured or Dark-fired, produced principally in a section west of the Tennessee River in Kentucky and extending into Tennessee.
Groups applicable to types 21, 22, and 23: A—Wrappers. B—Heavy Leaf. C—Thin Leaf. X—Lugs. N—Nondescript, as defined. S—Scrap, as defined.