I'm often looking for old physics papers that had a big impact on science (Nobel prize, for example). But I can't seem to find a lot of them. Is there a reason why some papers are not digitally available, but others (that had less impact) are?
Specifically, currently I'm looking for:
W.L. Bragg, The Diffraction of Short Electromagnetic Waves by a Crystal, Proceedings of the Cambridge Philosophical Society, 17 (1913), 43–57.
Does anybody know where to find it online? I have access to most of the journal databases.