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Ryan ChristoffLeon is exactly right. It's not really a legal issue. There may be one, but that's not the real issue. At least not for me. It's about common courtesy and respect. It might be legal for me to steal your scans and use them in some way that makes me money, but that doesn't make it right.
I am often asked for permission to use images on my website and without exception I have said yes. Usually, I will e-mail the person who asked many other images on the topic they are searching for that I have not put on my site. They never would have had access to these additional images had they simply taken the images on the site without asking.
-Ryan