United States National Register of Historic Places |
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Harquahala Mountain Smithsonian Solar Observatory Historic District
| NRHP ID: 97000346 |
| Location (in/near): Gladden, Arizona |
| Listed: 1997-05-01 |
| Role: District |
| Significance region: National |
| Significance area(s): Science |
Data from United States Park Service and Wikidata