United States National Register of Historic Places |
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Onyx Cave
| NRHP ID: 99000529 |
| NARA ID: 63820033 |
| Wikidata ID: Q29641982 |
| Wikpedia: Onyx Cave (Newburg, Missouri) |
| Location (in/near): Newburg, Missouri |
| Listed: 1999-05-21 |
| Role: Site |
| Significance region: Local |
| Significance area(s): Industry |
| Criteria: A (event) |
Data from United States Park Service and Wikidata