query: #Cats
  SELECT ?item ?itemLabel ?NRHP_reference_number ?NMSRCP_reference_number WHERE {
    ?item wdt:P1435 wd:Q19842079.
    SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
    OPTIONAL { ?item wdt:P649 ?NRHP_reference_number. }
    OPTIONAL { ?item wdt:P6473 ?NMSRCP_reference_number. }
  }