regular expressions

R related books: Traditional vs online publishing

How many R related books have been published so far? Who is the most popular publisher? How many other manuals, tutorials and books have been published online? Let’s find out. A few years ago I used the publication list on r-project.org as an argument with the IT department that R is an established statistical programming language and that they should allow me to install it on my PC. I believe at the time there were about 20 R related books available.