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Question: What does "links to PDF file" mean?
PDF stands for Portable Document Format.
Files of this type are reproductions of original publications with all of the color, pictures, and organization of the original.
If you print a PDF file, your copy will look as much like the original as your printer can produce.
To view a PDF file you will need a copy of the Adobe Acrobat Reader; this software is available free of charge from Adobe Systems.
There are two ways to view a PDF file:
to view the file immediately, have your browser call up the Acrobat Reader as a helper application to display the file
to view the file later, download the PDF file and use the Acrobat Reader to display the file.
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