Free-programming-books: 29 links quebrados

Usei https://github.com/tcort/markdown-link-check para escanear os links na página de recursos em inglês e encontrei alguns links inativos:

1843 links checked.

ERROR: 29 dead links found!
[✖] 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-34
[✖] http://dces.essex.ac.uk/staff/rpoli/gp-field-guide/toc.html → Status: 404
[✖] http://www.cleveralgorithms.com/nature-inspired/ → Status: 404
[✖] http://csunplugged.org/books/ → Status: 404
[✖] http://www.ethoberon.ethz.ch/WirthPubl/CBEAll.pdf → Status: 0
[✖] http://people.cs.aau.dk/~csj/Thesis/ → Status: 0
[✖] http://schoolofdata.org/handbook/ → Status: 503
[✖] https://people.math.gatech.edu/~cain/winter99/complex.html → Status: 0
[✖] https://people.math.gatech.edu/~herod/Hspace/Hspace.html → Status: 0
[✖] https://people.math.gatech.edu/~cain/notes/calculus.html → Status: 0
[✖] http://scpd.stanford.edu/knuth/index.jsp → Status: 404
[✖] https://developer.android.com/guide → Status: 0
[✖] http://www.oualline.com/books.free/style/ → Status: 0
[✖] http://codebeerstartups.com/2012/12/a-complete-guide-for-learning-backbone-js/ → Status: 404
[✖] https://bulletproofmeteor.com → Status: 503
[✖] http://docs.kali.org → Status: 403
[✖] https://common-lisp-reserve.github.io/solid-design-principles-in-common-lisp/solid-design-principles-in-common-lisp.pdf → Status: 404
[✖] https://github.com/clojurians-org/lisp-ebook/blob/master/Successful%20Lisp%20How%20to%20Understand%20and%20Use%20Common%20Lisp%20-%20David%20B.%20Lamkins.pdf → Status: 451
[✖] http://www.wolfram.com/learningcenter/tutorialcollection/ → Status: 404
[✖] http://books.sonatype.com/m2eclipse-book/reference/ → Status: 403
[✖] http://downloads.mysql.com/docs/mysql-tutorial-excerpt-5.5-en.pdf → Status: 404
[✖] http://www.ravichaganti.com//blog/wp-content/uploads/2010/12/A%20layman's%20guide%20to%20PowerShell%202.0%20remoting-v2.pdf → Status: 404
[✖] https://www.gitbook.com/book/devopscollective/secrets-of-powershell-remoting/details → Status: 0
[✖] https://www.penflip.com/powershellorg/the-dsc-book → Status: 0
[✖] http://inventwithpython.com/chapters/ → Status: 404
[✖] http://books.aidanf.net/learn-swift → Status: 0
[✖] https://itunes.apple.com/us/book/using-swift-cocoa-objective/id888894773?mt=11 → Status: 500
[✖] http://www.invece.org/tclwise/index.html → Status: 404
[✖] https://makinggameswithtypescript.com → Status: 0