Occurrence of Attributes in Original Text
The text related to the cultural heritage 'Cahokia Mounds State Historic Site' has mentioned 'Buffer zone' in the following places:
| Occurrence Sentence | Text Source |
|---|---|
| Although there is no official buffer zone, designation by the federal government of a larger area as a National Historic Landmark (1964), now containing additional State-owned property, provides equivalent protection. | UNESCO |