query: SELECT DISTINCT ?item (YEAR(?dop) as ?year) WHERE {
    # look for items of type "work" or "data" (or children)
    ?item wdt:P31/wdt:P279* ?pq . 
    VALUES ?pq { wd:Q386724  wd:Q42848 } 
    # get year of publication 
    ?item p:P577 ?statement .
    ?statement psv:P577 [
                  wikibase:timePrecision "9"^^xsd:integer ;
                  wikibase:timeValue ?dop ;
    ] .
    hint:Prior hint:rangeSafe true .
    FILTER (?dop < "1925-01-01T00:00:01"^^xsd:dateTime)
    FILTER NOT EXISTS { ?item wdt:P6216 [] }   # item does not have P6216 yet
  } limit 20000