watson, I along with you am considerate of copyrights. The .pdf files of all these publications (except, to my knowledge, the 50s books) are available from several other sources (e.g. freemind). I've not heard of any problems (nor have any others with whom I've discussed this issue).
I'm no lawyer, but I surmise that since this material is being distributed without charge, and since the original publishers no longer even make this material available, then any potential lawsuit would be hard-pressed to establish that any damages could be awarded.
My burner is warming up
Craig