{"nrhp_refnum":"91001369","name":"Etna Furnace (Boundary Decrease)","other_names":["See Also:Etna Furnace","Etna Furnace (Boundary Increase)"],"category":"district","location":{"address":"Roughly, area W of Etna Furnace buildings, N and S of Roaring Run","address_restricted":false,"city":"Mt. Etna","county":"Blair County","state":"PA","lat":40.525785453000054,"lon":-78.18916263651177,"geom_source":"nps_gis"},"listed_date":"1991-09-06","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Industry"],"significance_levels":["state"],"summary":null,"photo":null,"district":{"nrhp_refnum":"73001593","name":"Etna Furnace","url":"https://nationalhistoricalregister.com/districts/pennsylvania/etna-furnace-73001593/"},"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":null,"wikipedia":null,"wikidata":null},"indexable":false,"url":"https://nationalhistoricalregister.com/pennsylvania/blair-county/etna-furnace-boundary-decrease-91001369/"}