《汉书·志·地理志上》
这裹的土色青而捆疏，田是第七等，贡物是第八等；还杂有第七等和第九等。
厥土青黎。田下上，赋下中三错。
The soil here is bluish and loose, the fields are of the seventh grade, and the tribute is of the eighth grade; there are also some of the seventh and ninth grades.