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Starter Economy Deluxe Premium
200 US$ /Year 330 US$ /Year 475 US$ /Year 620 US$ /Year
10 GB Space 20 GB Space 40 GB Space 80 GB Space
20 Journals 40 Journals 80 Journals 160 Journals
15,000 PDF Papers 30,000 PDF Papers 60,000 PDF Papers 120,000 PDF Papers