{"nrhp_refnum":"82002542","name":"Duncan Farm","other_names":[],"category":"site","location":{"address":null,"address_restricted":true,"city":"Grafton","county":"Jersey County","state":"IL","lat":38.9681,"lon":-90.5136,"geom_source":"wikidata"},"listed_date":"1982-08-24","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Prehistoric"],"significance_levels":["national"],"summary":null,"photo":{"url_800":"https://nationalhistoricalregister.com/media/82002542/61bc95ed8a-800.webp","url_1600":"https://nationalhistoricalregister.com/media/82002542/61bc95ed8a-1600.webp","licence":"Public domain","author":"Nyttend","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Duncan_Farm_Site.jpg\" rel=\"noopener\">Nyttend</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Duncan_Farm_Site.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/28893046","wikipedia":"https://en.wikipedia.org/wiki/Duncan_Farm_(Grafton,_Illinois)","wikidata":"https://www.wikidata.org/wiki/Q18149569"},"indexable":true,"url":"https://nationalhistoricalregister.com/illinois/jersey-county/duncan-farm-82002542/"}