Referenced In

The Travels of Marco Polo
by Marco Polo, da Pisa Rusticiano

"Salt currency has a very wide diffusion from Muang Yong … to Sheu-pin [in Yun-nan, about lat. 23° 43′]."

The Travels of Marco Polo
by Marco Polo, da Pisa Rusticiano

"visited Sheu-ping, Lin-ngan and the upper valley of the River of Tungking on their way to Yun-nan-fu."