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Some more interesting freebies, this time a mixed bag but one that makes your little grey cells work a bit harder I would assume. ;-)
Civil Disobedience: https://www.amazon.com.au/Civil-Disobedience-Henry-David-Tho…
The Einstein Theory of Relativity A Concise Statement: https://www.amazon.com.au/Einstein-Theory-Relativity-Concise…
The Economic Consequences of the Peace: https://www.amazon.com.au/dp/B081QNC5ZP
US Links:
Civil Disobedience: https://www.amazon.com/Civil-Disobedience-Henry-David-Thorea…
The Einstein Theory of Relativity A Concise Statement: https://www.amazon.com/Einstein-Theory-Relativity-Concise-St…
The Economic Consequences of the Peace: https://www.amazon.com/dp/B081QNC5ZP
Enjoy!