Assertion: crested ibis | /r/AtLocation | gansu
Facets:
value: before 1950
type: TEMPORAL
Source sentences:
text: Although relevant evidence was poorly documented in Korea, Northern China, and Russia in the first half of the 20th century, in central China, the crested ibis was common in Gansu and Shaanxi Provinces before 1950 but nearly extinct by the end of 1950s.