There are possible literary references to Li's world map. An important clue is provided by Wu Sidao (烏斯道)'s anthology titled "Chuncaozhai Ji" (春草齋集), where Wu states that he had merged a map named "Guanglun Tu" (廣輪圖) and Li Rulin (李汝霖)'s "Shengjiao Beihua Tu" (聲教被化圖). Although his own map is not known today, Wu seems to have referred to Li's map concerned because the "Shengjiao Beihua Tu" would be an alias for "Shengjiao Guangbei Tu" (聲教廣被圖) and Rulin would have been Li Zemin's courtesy name. Wu states that Li's map was newer than the "Guanglun Tu" (circa 1360). Based on place names on the map, earlier studies presumed that the source map had been created around 1319 and revised sometime between 1329 and 1338. However, Wu suggests that Li's map was created sometime after 1360. Most importantly, Korea's attempt to merge Chinese maps had at least one precedent in the Mongol era.