Converting directly from a URL is not practical and would be very slow .. most convertion are done via command line and not directly with PHP for fast and better result.
I found some source code that took the contents of file_get_contents('url. Pdf') and did a rough conversion (and I mean very rough).
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.