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This link is library configurable to either appear as a single one-click solution which will appear like this:
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…or may say “Access Online” it may say View PDF/View Full Text or another label which is inherited from the first available link in the resulting drawer requiring the user to click again to view ALL the available sources for an article but with the LibKey PDF being at the top as seen below after the click via a drawer that expands from the right side of the screen. This second option then does require an additional click (one to expand this tray and the second to click on the PDF link):
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