R FAQ
Frequently Asked Questions on R
http://cran.r-project.org/doc/FAQ/R-FAQ.html#How-can-add_002don-packages-be-installed_003f
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R FAQ
Frequently Asked Questions on Rhttp://cran.r-project.org/doc/FAQ/R-FAQ.html#How-can-add_002don-packages-be-installed_003f 
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