Li Fang-Kuei
Early classifications, such as those of Li Fang-Kuei in 1937 and Yuan Jiahua in 1960, divided Min into Northern and Southern subgroups. However, in a 1963 report on a survey of Fujian, Pan Maoding and colleagues argued that the primary split was between inland and coastal groups. The inland varieties are distinguished by consistently having two distinct reflexes of Middle Chinese . The two groups also have differences in their vocabulary, including their pronoun systems.