Preservation Coverage by Query


Can also search for releases (eg, individual papers) or containers (eg, journals).
22,047,139
Known Releases
14,809,762 67.18% preserved and publicly accessible (bright)
3,417,473 15.51% preserved but not publicly accessible (dark)
3,819,904 17.33% no known independent preservation
22,047,139 total


Preservation Coverage by Year



Preservation Coverage by Release Type

Release Type Total Count Coverage
article-journal 18,659,125
article 3,365,829
paper-conference 22,185