<https://berthoud.catalog.aspencat.info/CloudLibrary/e1utdg9>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://berthoud.catalog.aspencat.info/GroupedWork/9743e59d-8d47-2eb8-adf2-eb0f6f986ca4-eng>