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Yes, PNAS Online is freely and immediately available to 139 developing countries. Please see our Developing Countries Initiatives page for more information. • How can I obtain a single copy of a paper or a single PNAS issue? You may purchase a single article ($10) or purchase access to the site for 7 days ($25) by American Express, Visa, or Mastercard from PNAS Online. Once you have selected an article you wish to access, a menu will appear on screen with ordering details. For older content not currently available at PNAS Online, you may obtain copies of articles from: Infotrieve Order Department 10966 Le Conte Avenue 2nd Floor Los Angeles, CA 90024 USA Fax: 1-310-208-5971 Phone: 1-800- 422-4633 or 1-310-208-1903 order{at}infotrieve.com Individual issues are available from Volume 104 (January 2007) to present. Volumes published prior to Volume 104 are out of print. Cost per issue: US $40, non-US $50. Price includes shipping. No discount allowed. For further information, please contact
