Preservation Coverage by Query


Can also search for releases (eg, individual papers) or containers (eg, journals).
22,183,859
Known Releases
15,273,910 68.86% preserved and publicly accessible (bright)
3,272,944 14.76% preserved but not publicly accessible (dark)
3,637,005 16.4% no known independent preservation
22,183,859 total


Preservation Coverage by Year



Preservation Coverage by Release Type

Release Type Total Count Coverage
article-journal 18,793,938
article 3,367,358
paper-conference 22,563