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 * [97 Things Every Programmer Should Know - Extended](https://leanpub.com/97-Things-Every-Programmer-Should-Know-Extended)
 * [A Mathematical Theory of Communication](http://ieeexplore.ieee.org/stamp/stamp.jsp?reload=true&arnumber=6773024&tp=) - Claude E.Shannon
-* [Ansible Up & Running (first three chapters, email required)](https://www.ansible.com/blog/free-ansible-book)
+* [Ansible Up & Running (first three chapters)](https://www.ansible.com/blog/free-ansible-book) *(account required)*
 * [Asterisk™: The Definitive Guide](http://asteriskdocs.org/en/3rd_Edition/asterisk-book-html-chunk/index.html)
 * [Barcode Overview](http://www.tec-it.com/download/PDF/Barcode_Reference_EN.pdf) (PDF)
 * [Come, Let's Play: Scenario-Based Programming Using Live Sequence Charts](http://www.wisdom.weizmann.ac.il/~playbook/)