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Since the launch of the Track II system of direct manuscript submission in late 1995, PNAS has expanded in size and scope.While PNAS Online is extremely popular and easy to navigate, receiving Ϸ6 million hits per month, some print issues of PNAS have tipped the scales at four pounds.For the convenience of readers, PNAS is moving from 26 biweekly issues per year to 52 weekly issues.Doubling the print frequency offers many advantages in addition to making issues more portable.The table of contents is easier to browse for relevant articles, and there are twice as many opportunities to feature papers with covers, cover taglines, or commentaries.The change in print frequency will not affect the online journal.New content will still be published online in PNAS Early Edition each business day.As a reader service, PNAS continues to offer two types of free e-mail alerts:
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