cc-by-4.0Hyvönen, EeroLeskinen, PetriTuominen, Jouni2025-03-242022-06-102022-06-10https://hydatakatalogi-test-24.it.helsinki.fi/handle/123456789/9418LetterSampo CKCC Knowledge Graph The documentation of LetterSampo CKCC dataset is available on Linked Data Finland page and explained in more detail on the project page. This dataset is available on a public SPARQL endpoint (https://ldf.fi/ckcc/sparql).Openhistorylinked open datadigital humanitiescultural heritageepistolary dataRDFSemantic Webdataset