Are all of his works now considered public domain?
As I understand it, yes. Anything before 1923 should be free and clear. He died in 1932, but even if he drew something on his death bed it should be free now.[Once you start thinking about artists creating in the late sixties and seventies, though, forget about it. And basically anything being created in our lifetime will never be in the public domain in our lifetime, unless the artist puts it there explicitly.]But any of his images I post here are public domain according to the Internet Archive. And my cropping and editing them should not effect that at all. (I think some people do claim new copyrights for scanning and such, but I think that is pretty lazy and selfish).
Not to mention petty and downright evil. Copyright is a hot button in relationship to the internet. As far as I know, it's a FREE SPEECH issue compared to an Economic issue. Corporations depend on Copyright since it gives them a monopoly over their creations. But watch out, we have the Internet!The Internet breaks copyright completely since you can copy *anything* perfectly.