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51.41. pg_publication_rel
  The catalog pg_publication_rel contains the mapping between relations and publications in the database. This is a many-to-many mapping. See also Section 51.78 for a more user-friendly view of this information.
Table 51.41. pg_publication_rel Columns
| Name | Type | References | Description | 
|---|---|---|---|
prpubid | 
        oid | 
        pg_publication.oid | 
        Reference to publication | 
prrelid | 
        oid | 
        pg_class.oid | 
        Reference to relation | 
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 https://www.postgresql.org/docs/10/catalog-pg-publication-rel.html