1.This set of postcards was issued approximately between 1900 and 2000, and the exact year is uncertain.
2.Shennongjia Forestry District is a national nature reserve, a well - preserved virgin forest area and a key ecological function zone. It is China's first "triple - crowned" heritage site inscribed under three major protection systems of UNESCO, namely the Man and the Biosphere Reserve, the Global Geopark, and the World Heritage.