There have been two editions of these, the first around 1976 and the second around 1991. They are sometimes called the red volumes because they are bound in red covers and have most pages printed in red ink on white paper.
| Graph IRI | Count |
|---|---|
| http://dbkwik.webdatacommons.org | 9 |
![[RDF Data]](/fct/images/sw-rdf-blue.png)
