Online Readings: (available on CRAN at http://cran.us.r-project.org/other-docs.html)
Kuhnert, P. and W. Venebles, 2005, An Introduction to R: Software for Statistical Modelling & Computing. CSIRO Australia (.pdf)
Owen, W.J., 2010, The R Guide. Dept. of Mathematics and Computer Science, University of Richmond. (.pdf)
Rossiter, D.G., 2012, Introduction to the R Project for Statistical Computing for use at ITC. International Institute for Geo-information Science & Earth Observation (ITC)
Maindonald, J.H., 2008, Using R for Data Analysis and Graphics, an Introduction (.pdf)
Healy, K., 2019, Data Visualization, a practical introduction. (Princeton Univ. Press) https://kjhealy.github.io/socviz/
Hijmans, R., 2016, Spatial Data Analysis and Modeling with R http://rspatial.org
Peng, R.D., 2016, R Programming for Data Science https://bookdown.org/rdpeng/rprogdatascience/
Grolemund, G. and H. Wickham, 2016, R for Data Science, http://r4ds.had.co.nz
Peng, R.D., 2016, Exploratory Data Analysis with R, https://bookdown.org/rdpeng/exdata/
Phillips, N.D., 2017, YaRrr — The Pirate’s Guide to R [https://bookdown.org/ndphillips/YaRrr/]
Ismay, C. 2016, Getting used to R, RStudio, and Markdown [https://bookdown.org/chesterismay/rbasics/]
Kabacoff, R., 2018, Data Visualization with R https://rkabacoff.github.io/datavis/
Simple features (sf) web site [https://r-spatial.github.io/sf/index.html]
Stars project (stars) web site [http://r-spatial.org/r/2017/11/23/stars1.html]
Lovelace, R., J. Nowosad, and J. Muenchow, 2017, Geocomputation with R [https://bookdown.org/robinlovelace/geocompr/]
Cleveland, W.S., 1993, Visualizing Data, Hobart Press, 360 p.
Bivand, R.S., E.J. Pebesma and V. Gomez-Rubio (2013) Applied Spatial Data Analysis with R, Springer, 405 p.
Rogerson, P.A., 2001, Statistical Methods for Geography, Sage, 236 p.
Fotheringham, A.S., C. Brunsdon, and M. Charlton (2000) Quantitative Geography, Sage, 270 p.
R Spatial http://rspatial.org/analysis/index.html
R Bloggers https://www.r-bloggers.com
R Weekly https://rweekly.org
r.statistics.co http://r-statistics.co/
Bookdown https://bookdown.org
RStudio Blog https://blog.rstudio.org
Quick R http://www.statmethods.net
R Graph Gallery http://www.r-graph-gallery.com