diff --git a/free-programming-books.md b/free-programming-books.md
index 873f6fc2b..e73ebef26 100644
--- a/free-programming-books.md
+++ b/free-programming-books.md
@@ -193,6 +193,7 @@
 * [The Design of Approximation Algorithms](http://www.designofapproxalgs.com/book.pdf) (PDF)
 * [Lectures Notes on Algorithm Analysis and Computational Complexity (Fourth Edition)](http://larc.unt.edu/ian/books/free/lnoa.pdf), University of North Texas (PDF)
 * [Problems on Algorithms (Second Edition)](http://larc.unt.edu/ian/books/free/poa.pdf), University of North Texas (PDF)
+* [Mastering Algorithms with C](http://www.das.ufsc.br/~romulo/discipli/cad-fei/Mastering-Algorithms-with-C-Loudon.pdf) (PDF)
 
 ####Theoretical Computer Science
 * [An Introduction to the Theory of Computation](http://www.cse.ohio-state.edu/~gurari/theory-bk/theory-bk.html)
@@ -346,6 +347,7 @@
 * [Data-Intensive Text Processing with MapReduce](http://www.umiacs.umd.edu/~jimmylin/MapReduce-book-final.pdf) (PDF)
 * [Designing Interfaces](http://designinginterfaces.com) by Jennifer Tidwell
 * [Digital Signal Processing For Engineers and Scientists](http://www.dspguide.com/)
+* [Digital Signal Processing For Communications](http://www.sp4comm.org/)
 * [Distributed systems for fun and profit](http://book.mixu.net/distsys/single-page.html)
 * [Flow based Programming](http://jpaulmorrison.com/fbp/#book)
 * [Getting Real](http://gettingreal.37signals.com/)
@@ -363,6 +365,7 @@
 * [High-Performance Scientific Computing](http://bit.ly/hpc12) (class lectures and slides)
 * [Mother Tongues of Computer Languages](http://www.digibarn.com/collections/posters/tongues/) (PNG)
 * [Open Government;Collaboration, Transparency, and Participation in Practice](https://github.com/oreillymedia/open_government)
+* [How to Become a Programmer](http://softwarebyrob.wpengine.netdna-cdn.com/assets/Software_by_Rob%20_How_to_Become_a%20_Programmer_1.0.pdf)
 
 ####Web Performance
 * [Book of Speed](http://www.bookofspeed.com/index.html) by Stoyan Stefanov
@@ -436,6 +439,7 @@
 * [Bash Guide for Beginners](http://www.tldp.org/LDP/Bash-Beginners-Guide/html/) by Machtelt Garrels
 * [Lhunath's Bash Guide](http://mywiki.wooledge.org/BashGuide)
 * [The Command Line Crash Course](http://learncodethehardway.org/cli/book/) (also a Powershell reference)
+* [Learning the bash Shell](http://www.redbrick.dcu.ie/~teapott/MECS/Notes/learning_bash.pdf)
 
 
 ###C
@@ -466,6 +470,7 @@
 * [Introduction to Design Patterns in C++ with Qt](http://ptgmedia.pearsoncmg.com/images/9780131879058/downloads/0131879057_Ezust_book.pdf)
 * [Data Structures and Algorithms with Object-Oriented Design Patterns in C++](http://www.brpreiss.com/books/opus4/index.html)
 * [The Boost C++ libraries](http://en.highscore.de/cpp/boost)
+* [C++ Cookbook](http://staff.ppu.edu/dkhalid/O'Reilly%20-%20C++%20Cookbook%20(2007).pdf)
 
 ###Clojure
 * [A Brief Beginner’s Guide To Clojure](http://www.unexpected-vortices.com/clojure/brief-beginners-guide/)
@@ -777,7 +782,7 @@ See also [TeX](#tex)
 * [Ubuntu Pocket Guide and Reference](http://www.ubuntupocketguide.com/index_main.html)
 * [What Every Programmer Should Know About Memory](http://www.akkadia.org/drepper/cpumemory.pdf) (PDF)
 * [Learning Debian GNU/Linux](http://oreilly.com/openbook/debian/book/index.html)
-
+* [Upstart Intro, Cookbook and Best Practises](http://upstart.ubuntu.com/cookbook/)
 
 ###Lisp
 * [Common Lisp the Language, 2nd Edition](http://www.cs.cmu.edu/Groups/AI/html/cltl/mirrors.html)