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The NSF Public Access Repository (NSF-PAR) system and access will be unavailable from 5:00 PM ET until 11:00 PM ET on Friday, June 21 due to maintenance. We apologize for the inconvenience.


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Do you have questions about NSF-PAR content, procedures, or policies? More information is available at NSF's Public Access page and in our Frequently Asked Questions. You may also leave feedback by clicking on this .