{"nrhp_refnum":"84003428","name":"Duncan Island (36LA60,61)","other_names":["36la60,61"],"category":"site","location":{"address":null,"address_restricted":true,"city":"Holtwood","county":"Lancaster County","state":"PA","lat":39.8614,"lon":-76.3636,"geom_source":"wikidata"},"listed_date":"1984-05-10","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Prehistoric"],"significance_levels":["state"],"summary":null,"photo":{"url_800":"https://nationalhistoricalregister.com/media/84003428/9777893950-800.webp","url_1600":"https://nationalhistoricalregister.com/media/84003428/9777893950-1600.webp","licence":"CC BY-SA 4.0","author":"Thomas Herr","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:2K3A2653_-_Copy.jpg\" rel=\"noopener\">Thomas Herr</a>, <a href=\"https://creativecommons.org/licenses/by-sa/4.0\" rel=\"license noopener\">CC BY-SA 4.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:2K3A2653_-_Copy.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71996413","wikipedia":"https://en.wikipedia.org/wiki/Duncan_Island_(36LA60,61)","wikidata":"https://www.wikidata.org/wiki/Q5314399"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/lancaster-county/duncan-island-36la60-61-84003428/"}