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What is a PDF and how do I use one?

The Portable Document Format is an open file format used to display integrated text and illustrations universally, optimized for the highest quality graphics with the smallest file sizes. You can download and open them in a PDF-reading program to view on screen and/or print out physical copies. All of our PDFs are print-resolution unless otherwise indicated. Click here to download the free Adobe Acrobat Reader for Windows, Mac or Linux. Over at Wikipedia, you can read more about PDFs as well as see a list of various PDF readers.