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Data should be accessible for everyone, especially for educational and research purposes. Exceptions are of course personal, sensitive data - this is only owned by yourself, and you decide to share it or not. Otherwise, I do not like payment or effort walls. Below links to some freely accessible data from different providers. I am not connected with any of those and do not take any responsibility for that data (nevertheless, I post here only links which seem to lead to reliable and free data at the time when I add the link).
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