Hitchhiker's guide to ggplot2 in R - free ebook on Leanpub

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From the department of “How did I miss this?”: Hitchhiker’s guide to ggplot2 in R - free ebook on Leanpub
If I like it, I’ll buy the enhanced ebook with datasets and R Markdown notebooks!
Hopefully it will help me with density plots! Which will help me make ggjoy() work with my vancouver instagram january 2016 average colour data