Preservation Coverage by Query


Can also search for releases (eg, individual papers) or containers (eg, journals).
22,316,050
Known Releases
15,339,775 68.74% preserved and publicly accessible (bright)
3,288,904 14.74% preserved but not publicly accessible (dark)
3,687,371 16.53% no known independent preservation
22,316,050 total


Preservation Coverage by Year



Preservation Coverage by Release Type

Release Type Total Count Coverage
article-journal 18,914,615
article 3,378,694
paper-conference 22,741