Preservation Coverage by Query


Can also search for releases (eg, individual papers) or containers (eg, journals).
18,672,655
Known Releases
12,115,009 64.89% preserved and publicly accessible (bright)
2,494,285 13.36% preserved but not publicly accessible (dark)
4,063,361 21.77% no known independent preservation
18,672,655 total


Preservation Coverage by Year



Preservation Coverage by Release Type

Release Type Total Count Coverage
article-journal 15,818,928
article 2,837,870
paper-conference 15,857