original. https://creativecommons.org/licenses/by-sa/3.0CC BY-SA 3.0 Creative Commons Attribution-Share Alike 3.0 truetrue English Radon in periodic table...
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This United States Congress image is in the public domain. This may be because it was taken by an employee of the Congress as part of that person’s official...
Mary-Land, New-York : with new maps of every place, together with astronomical tables ... and how to make sun-dials fitting for all those places Publisher London :...
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Creative Commons Attribution-Share Alike 4.0 truetrue English Periodic table of the elements, updated and fixed, in Spanish (26/may/2023) Spanish Tabla...
years, Colombia has 80 years, and Guatemala and Samoa have 75 years. This image may not be in the public domain in these countries, which moreover do not...