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Proceedings of the National Academy of Sciences of the United States of America

PNAS is one of the world's most-cited multidisciplinary scientific serials. Since its establishment in 1914, it continues to publish cutting-edge research reports, commentaries, reviews, perspectives, colloquium papers, and actions of the Academy. Coverage in PNAS spans the biological, physical, and social sciences. PNAS is published weekly in print, and daily online in PNAS Early Edition. The PNAS impact factor is 9.598 and the Eigenfactor is 1.7 for 2007. PNAS is available by subscription.

PNAS is abstracted and/or indexed in: Index Medicus, PubMed Central, Current Contents, Medline, SPIN, JSTOR, ISI Web of Science, and BIOSIS.


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PNAS Online launched in January 1997 and now receives over 11.6 million hits per month. The site contains the full text, figures, tables, equations, and references of all articles in PNAS dating back to 1990.

PNAS articles are also published online before print in a feature called PNAS Early Edition as soon as they are accepted and final author changes are made. Release of articles became daily in June 2002. The date of online release is posted on the website and is the official date of publication. Papers are published online 1 to 5 weeks before they appear in print. PNAS can now offer publication in as little as 3.5 weeks after acceptance to authors who return their proofs quickly


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List of 2009 Issues: Volume 106
January February March
(1): January 6
(2): January 13
(3): January 20
(4): January 27
  		 (5): February  3
(6): February 10
(7): February 17
(8): February 24 		(9): March 3
(10): March 10
(11): March 17
(12): March 24
(13): March 31
April May June
(14): April 7
(15): April 14
(16): April 21
(17): April 28		 (18): May 5
(19): May 12
(20): May 19
(21): May 26
 (22): June 2
(23): June 9
(24): June 16
(25): June 23
(26): June 30
July August September
(27): July 7
(28): July 14
(29): July 21
(30): July 28
 (31): August 4
(32): August 11
(33): August 18
(34): August 25 		(35): September 1
(36): September 8
(37): September 15
(38): September 22
(39): September 29
October November December
(40): October 6
(41): October 13
(42): October 20
(43): October 27
 (44): November 3
(45): November 10
(46): November 17
(47): November 24		 (48): December 1
(49): December 8
(50): December 15
(51): December 22
(52): December 29

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