https://www.geeksforgeeks.org/working-with-pdf-files-in-python/

https://medium.com/@rqaiserr/how-to-convert-pdfs-into-searchable-key-words-with-python-85aab86c544f

https://automatetheboringstuff.com/chapter13/

https://stackoverflow.com/questions/17098675/searching-text-in-a-pdf-using-python https://medium.com/@CharlesBordet/how-to-extract-and-clean-data-from-pdf-files-in-r-da11964e252e

http://okfnlabs.org/blog/2016/04/19/pdf-tools-extract-text-and-data-from-pdfs.html https://gitlab.com/pdfgrep/pdfgrep