PREFIX a: <https://hollisarchives.lib.harvard.edu/ontology#>
PREFIX dct: <http://purl.org/dc/terms/>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
SELECT ?series (COUNT(?c) AS ?components) WHERE {
?s a a:Series ; rdfs:label ?series .
?c dct:isPartOf+ ?s .
} GROUP BY ?series ORDER BY DESC(?components)