There is pdftotext (part of xpdf ). It will extract text from PDF files (if it is stored as text in the PDF, and not as an image). You could probably use that.
If your pdfs already contain the text, then your job will be much easier: tools like pdftotext and pdftohtml will give you image and text output (see the Ubuntu package xpdf-utils).
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.