query: SELECT ?item ?itemLabel ?value WHERE {
    ?item p:P528 ?st.
    ?st ps:P528 ?value.
    ?st pq:P972 wd:Q634670. # Incunabula Short Title Catalogue
    SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
  }
  LIMIT 100