DIGGIPDF is the biggest collection of free books, textbooks about business, education, medicine, religion, science. All documents are in PDF format. This source contains more than 5 000 000 files and updated every day.
Last Updated 22 February 2012 : Total (12,385,391 files and counting)
PDF format is one of the oldest formats for representation of the documents. It was created in 1993 by the Abode company. This format is widely spread on the Internet. To open PDF you need a special program Adobe Reader or you can view it online on this site.
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Adobe Portable Document Format