Wagner even mentions that there were multiple ironsites per commandery ie so the number of iron offices recorded in the Hanshu do not reflect reality.
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From 漢代大鐵官管理職官的再研究,Li Jinghua using inscriptions of Han era iron objects has found that larger iron offices ie Hedong had multiple sites(Zuofang作坊).
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Li Jinghua has shown that some Zuofang have further divisions. ie The Zuofang of Shanyang II has 2 subsidiary Zuofang sites. Keep in mind Shanyang commandery only has two large Zuofang sites ie Shanyang I and Shanyang II while the largest sites such as Hedong commandery has 4 large Zuofang sites ie Dong I,Dong II,Dong III and Dong IV.
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This is far from the exception,while the inscriptions show that Nanyang commandery consists Yang I and Yang II Zuofang sites though in reality there's as many as eight separate Zuofang sites. With Yang I definitely having subsidiary divisions while Yang II is murkier. Li Jinghua comes to the conclusion that the Nanyang and Hanzhong commanderies has the highest sites of the various commanderies.
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Using the previous examples Li Jinghua also notes that the extremely large iron offices that contain 3 or 4 Zuofang sites should actually have 5 or 6 Zuofang sites.
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