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PDFSplit! is a free online PDF splitter. No installation, no registration, it

SourceForge.net. Fast, secure and free downloads from the largest Open Source applications and software directory

A-PDF Solution is a PDF software developer who focuses on providing affordable Acrobat PDF tools and customization service for personal and small business.

wikiHow is a wiki based collaboration to build the world’s largest, highest quality how to manual. Our multilingual how to manual has free step-by-step instructions on how to do all types of things.

Sciweavers is a bookmarking network for researchers to share and explore research paper preprints grouped by conference name and year or subject area.

Kvisoft, professional Flash flipping book and Flash photo software provider, dedicates to offering you an easy way to make PDF flipping page book and Flash photo albums.

Scientific physics forums for professionals and students to discuss serious issues and topics regarding physics in theory, practice, study and reality. Students can also find help for homework and career perspectives

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The Adobe Acrobat User Community is a global resource for users of Acrobat and PDF, with free eseminars, tips, tutorials, videos and discussion forums.