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ESO on Twitter: "On 26 January 1954 astronomers from six European countries signed the Leiden Declaration, recommending the establishment of a joint European Observatory. Credit: @ESO https://t.co/ao7nntC8n3 https://t.co/f8i5L4bL4c" / Twitter
t.14 (1879) - Archives néerlandaises des sciences exactes et naturelles - Biodiversity Heritage Library
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Declaration by the Governments of Great Britain, Denmark, France, Germany, the Netherlands, and Sweden on the Subject of the Mai
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