PNAS is one of the world's most-cited and comprehensive multidisciplinary scientific journals, publishing more than 3,800 research papers annually. Established in 1914, PNAS publishes cutting-edge research, science news, Commentaries, Reviews, Perspectives, Colloquium Papers, and actions of the National Academy of Sciences.
PNAS Online launched in January 1997 and now receives over 21 million hits per month. The site contains PDFs of all articles in PNAS dating back to 1915, and the full text, figures, tables, equations, and references dating back to November 1996.
The journal's content spans the biological, physical, and social sciences and is global in scope. Nearly half of all accepted papers come from authors outside the United States.