As I was searching for help on some R functions, I came across a very useful page from the National Parks Service (NPS) - Using R Statistical and Graphics Tools for Natural Resource Stewardship Science. Turns out NPS uses R for data management and report generation - how cool is that!
In particular, they have very helpful overview of R's Data Import/Export, Data Manipulation, Statistical Formulas and several other advanced topics.
And as a bonus, here is a link to an R Reference Card - very handy.
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