Matches in DBpedia 2014 for { ?s ?p Lock and Dam No. 21 Historic District. }
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- National_Register_of_Historic_Places_listings_in_Adams_County,_Illinois article "Lock and Dam No. 21 Historic District".
- National_Register_of_Historic_Places_listings_in_Adams_County,_Illinois name "Lock and Dam No. 21 Historic District".
- Lock_and_Dam_No._21_Historic_District label "Lock and Dam No. 21 Historic District".