I seriously doubt that any rule says that sources must be free. It helps in double-checking some statements if other people can at least see the abstract of an article, which is why pubmed...gov is so good. Old books might be better than new studies in some cases, and even when those are public domain, they are not really free. Someone has to pay time for scanning, or copying and supply web space, which is why project Gutenberg is so good. _______ Shaw's Principle: Build a system that even a fool can use, and only a fool will want to use it. http://ecn.ab.ca/~brewhaha/WP_CRYSTAL.HTM
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