Matches in DBpedia 2015-10 for { ?s ?p "Helvig-Olson Farm Historic District"@en }
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- National_Register_of_Historic_Places_listings_in_Clinton_County,_Iowa article "Helvig-Olson Farm Historic District".
- Helvig-Olson_Farm_Historic_District name "Helvig-Olson Farm Historic District".
- National_Register_of_Historic_Places_listings_in_Clinton_County,_Iowa name "Helvig-Olson Farm Historic District".
- Helvig-Olson_Farm_Historic_District label "Helvig-Olson Farm Historic District".
- Helvig-Olson_Farm_Historic_District name "Helvig-Olson Farm Historic District".