Be aware that links may not work in the future, If you can download the actual material and keep it locally, then you will have it when needed, I have a massive collection of links, saved over many years of research, that takes me up many a dead end these days.

Be aware that links may not work in the future, If you can download the actual material and keep it locally, then you will have it when needed, I have a massive collection of links, saved over many years of research, that take me up a dead end these days.