I, too, have an original of Loomis's "Creative Illustration" and find it a treasure trove of information. One caveat: the book is still under copyright, I believe, so unless the web sites that have it posted have done so by permission, it's likely they're in violation of copyright.
As a writer and painter, I believe (for obvious reasons) that copyright should not be evaded, even for the greater good, and even when the material is out of print.
My 2 cents.
Regards,
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