Whew, copyright laws give me a headache. Been trying to find information on my own, but of course, have had no luck. So I'm hoping someone can help me out on here. 
I know the general rule is, if it's been published before 1923 then it is in public domain (please do correct me if I'm wrong). Now does this also include foreign books? And is there any website where I could look up a book to see if it is in public domain? (Or how am I supposed to tell if it is or isn't in the public domain) Any help would be appreciated. Thanks!

I know the general rule is, if it's been published before 1923 then it is in public domain (please do correct me if I'm wrong). Now does this also include foreign books? And is there any website where I could look up a book to see if it is in public domain? (Or how am I supposed to tell if it is or isn't in the public domain) Any help would be appreciated. Thanks!