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library genesis is a scientific community targeting collection of books on natural science disciplines and engineering.

mdpi is a publisher of peer-reviewed, open access journals since its establishment in 1996.

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proceedings of the national academy of sciences (pnas), a peer reviewed journal of the national academy of sciences (nas) - an authoritative source of high-impact, original research that broadly spans the biological, physical, and social sciences.

science/aaas peer-reviewed journals deliver impactful research, daily news, expert commentary, and career resources.

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internet archive is a non-profit digital library offering free universal access to texts, movies & music, as well as 624 billion archived web pages.

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