Assertion: bog | /r/HasProperty | designated a national natural landmark
Facets:
value: in 1972
type: TEMPORAL
value: in 1973
type: TEMPORAL
Source sentences:
text: The bog was designated a National Natural Landmark in 1973 as the only remaining open-water quaking bog in Illinois.
text: The bog was named as an Illinois Nature Preserve in 1970, and was designated a National Natural Landmark in 1972.