Fig. 7

\({\text{PO}}_{4}^{3 - }\) contents of soil samples from bronze artifacts unearthed at Lijiaba site, Yunyang county compared with Tuchengpo site, Wushan county
\({\text{PO}}_{4}^{3 - }\) contents of soil samples from bronze artifacts unearthed at Lijiaba site, Yunyang county compared with Tuchengpo site, Wushan county