Assertion: grassland's population | /r/HasProperty | reintroduced into the prairie dog towns
Facets:
value: after a 70-year absence
type: TEMPORAL
Source sentences:
text: On October 2, 2009, in a ceremony at Belza House, the park was declared a dark-sky preserve, and a small population of black-footed ferrets was reintroduced into the prairie dog towns after a 70-year absence.