query: SELECT distinct ?jLabel ?dLabel (count(*) as ?num) (SAMPLE(?item) as ?sampleitem){
    ?item p:P6216 ?statement .
    ?statement ps:P6216 ?pd .                    # copyright status = public domain
    ?statement pq:P1001 ?j .
    ?statement pq:P459  ?d .
    VALUES ?pd { wd:Q19652 wd:Q15687061 } 
    SERVICE wikibase:label { bd:serviceParam wikibase:language "en". }
  } group by ?jLabel ?dLabel
  order by ?num