Papyri.info provides access to three largely overlapping collections of digitized papyri: the Duke Databank of Documentary Papyri (DDbDP), the Heidelberger Gesamtverzeichnis (HGV), and the Advanced Papyrological Information System (APIS). You can browse their collections by the print publication in which the relevant edition was published. For example, papyri from the series The Oxyrhynchus Papyri are listed under papyri.info/ddbdp/p.oxy.