diff --git a/free-programming-books.md b/free-programming-books.md
index ad794059d..ff72c300e 100644
--- a/free-programming-books.md
+++ b/free-programming-books.md
@@ -261,7 +261,6 @@
 * [Microsoft Press: Free E-Books](https://mva.microsoft.com/ebooks)
 * [Microsoft Technologies 1, including books on Windows Azure, SharePoint, Visual Studio Guide, Windows phone development, ASP.net, Office365, etc. collection by Eric Ligman](https://blogs.msdn.microsoft.com/mssmallbiz/2012/07/27/large-collection-of-free-microsoft-ebooks-for-you-including-sharepoint-visual-studio-windows-phone-windows-8-office-365-office-2010-sql-server-2012-azure-and-more/)
 * [Microsoft Technologies 2, including books on Windows Azure, SharePoint, Visual Studio Guide, Windows phone development, ASP.net, etc. collection by Eric Ligman](https://blogs.msdn.microsoft.com/mssmallbiz/2012/07/30/another-large-collection-of-free-microsoft-ebooks-and-resource-kits-for-you-including-sharepoint-2013-office-2013-office-365-duet-2-0-azure-cloud-windows-phone-lync-dynamics-crm-and-more/)
-* [Microsoft Technologies 3, including books on Windows Azure, SharePoint, Visual Studio Guide, Windows phone development, ASP.net, etc. collection by Eric Ligman](https://blogs.msdn.microsoft.com/mssmallbiz/2017/07/11/largest-free-microsoft-ebook-giveaway-im-giving-away-millions-of-free-microsoft-ebooks-again-including-windows-10-office-365-office-2016-power-bi-azure-windows-8-1-office-2013-sharepo/)
 * [O'Reilly's Open Books Project](http://www.oreilly.com/openbook/)
 * [Papers we love](https://github.com/papers-we-love/papers-we-love)
 * [Programming](https://en.wikibooks.org/wiki/Category%3aComputer_programming) - Wikibooks
@@ -322,8 +321,6 @@
 * [Animated Algorithm and Data Structure Visualization](http://visualgo.net) (Resource)
 * [Annotated Algorithms in Python: Applications in Physics, Biology, and Finance](https://github.com/mdipierro/nlib) - Massimo di Pierro
 * [Binary Trees](http://cslibrary.stanford.edu/110/BinaryTrees.pdf) (PDF)
-* [Clever Algorithms](http://www.cleveralgorithms.com/nature-inspired/) - Jason Brownlee
-* [CS Unplugged: Computer Science without a computer](http://csunplugged.org/books/)
 * [Data Structures](http://www.cse.iitd.ernet.in/~suban/cs130/index.html) - Prof. Subhashis Banerjee, IIT Delhi
 * [Data Structures (Into Java) - Paul N. Hilfinger](http://www-inst.eecs.berkeley.edu/~cs61b/fa14/book2/data-structures.pdf) (PDF)
 * [Data Structures and Algorithms: Annotated Reference with Examples](https://web.archive.org/web/20170715160229/http://dotnetslackers.com/Community/files/folders/data-structures-and-algorithms/entry30283.aspx) - G. Barnett and L. Del Tongo
@@ -592,7 +589,6 @@
 * [Coding With Minecraft](https://turtleappstore.com/book/) - Al Sweigart
 * [Come, Let's Play: Scenario-Based Programming Using Live Sequence Charts](http://www.wisdom.weizmann.ac.il/~playbook/)
 * [Communicating Sequential Processes](http://www.usingcsp.com/cspbook.pdf) - Tony Hoare (PDF)
-* [Computer Musings](http://scpd.stanford.edu/knuth/index.jsp) (lectures by Donald Knuth)
 * [Confessions of an Unintentional CTO: Lessons in Growing a Web App](http://www.jackkinsella.ie/books/confessions_of_an_unintentional_cto) - Jack Kinsella
 * [Culture \& Empire: Digital Revolution](http://hintjens.com/books) (PDF)
 * [Design With FontForge](http://designwithfontforge.com/en-US/index.html)