In the past year alone, JSTOR has doubled its ebook sales and the number of participating libraries. After launching in 2013 with 20 publishers, 15,000 ebooks and zero library customers, those numbers now stand at 100, 40,000 and 1,000, respectively, said Frank Smith, director of Books at JSTOR. Of course, the database also offers access to more than 2,000 scholarly journals.