The Proceedings of the National Academy of Sciences (PNAS) is pleased to announce that its legacy content dating back to volume 1, issue 1, in 1915 is now digitally archived, searchable, and freely available on the PNAS web site.
"PNAS presents its free digital archive in conjunction with its 90th anniversary. The digital collection spans nearly a century of seminal scientific research, and comprises more than 390,000 pages and 80,000 articles. We encourage everyone to browse and read the PNAS digital collection, which contains research of exceptional importance and broad interest.
PNAS is a break-even operation and relies about equally on author fees and on subscription fees to cover its operating costs. PNAS subscribers gain access to the most recent 6 months of published content."