1950 The Yen Pien Region is rich in deposits[...] [1]
1964 In the Yen Pien area in Kirin province, for instance, very few fruit trees existed in the past. In 1964, apple trees alone covered 45,000 mow. [2]
--Geographyinitiative (talk) 23:02, 21 August 2021 (UTC)