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 #### Algorithms & Data Structures
 
-* [A Field Guide To Genetic Programming](https://b-ok.cc/book/861921/18f698) - Riccardo Poli et al. (PDF)
+* [A Field Guide To Genetic Programming](https://web.archive.org/web/20191020195105/http://www0.cs.ucl.ac.uk/staff/W.Langdon/ftp/papers/poli08_fieldguide.pdf) - Riccardo Poli et al. (PDF)
 * [Algorithm Design](https://archive.org/details/AlgorithmDesign1stEditionByJonKleinbergAndEvaTardos2005PDF) - Jon Kleinberg and Éva Tardos (PDF)
 * [Algorithmic Graph Theory](http://code.google.com/p/graphbook/)
 * [Algorithms](https://en.wikibooks.org/wiki/Algorithms) - Wikibooks