Assertion: town's area | /r/HasProperty | delineated using same basic threshold
Facets:
value: for each decennial census
type: TEMPORAL
value: since 1950
type: TEMPORAL
Source sentences:
text: Urbanized areas have been delineated using the same basic threshold (50,000 population) for each decennial census since 1950, but procedures for delineating the urban fringe are more liberal today.