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This web location contains a huge amount of material, most of which is free. The focus is on quality, accessibility, factual correctness, and honest presentation in a clear layout, rather than on seduction and deceit. Also, no intrusive advertisements, cookies, or search engine analytics are implemented. On the rest of the Internet one can see how rare and valuable this is. If desired one can express one's appreciation through a financial contribution; the below PayPal button allows one enter the amount of one's choice. Or one can use one of these alternative methods of payment.

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