Preservation Coverage by Query


Can also search for releases (eg, individual papers) or containers (eg, journals).
18,511,464
Known Releases
12,004,592 64.85% preserved and publicly accessible (bright)
2,490,311 13.46% preserved but not publicly accessible (dark)
4,016,561 21.7% no known independent preservation
18,511,464 total


Preservation Coverage by Year



Preservation Coverage by Release Type

Release Type Total Count Coverage
article-journal 15,670,982
article 2,824,667
paper-conference 15,815