7 C.F.R. § 29.2696
Groups A—Wrappers. B—Heavy Leaf. C—Thin Leaf. X—Lugs. N—Nondescript. S—Scrap. Qualities 1—Choice. 2—Fine. 3—Good. 4—Fair. 5—Low. Colors L—Light brown. F—Medium brown. D—Dark brown. M—Mixed or variegates. VF—Greenish medium brown. G—Green.