http://datasciencespecialization.github.io/
http://sux13.github.io/DataScienceSpCourseNotes/
Directory Tree
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├── 1-The-Data-Scientists-Toolbox
│ └── lectures
├── 2-R-Programming
│ ├── book
│ ├── dpqr
│ ├── lectures
│ ├── ProgAssignment3-data
│ └── w2-specdata
└── 3-Getting-and-Cleaning-Data