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Aberration in optical systems; from the 1911 encyclopaedia;
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This image comes from the 13th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States.
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La bildo estas kopiita de wikipedia:en. La originala priskribo estas: Aberration in optical systems; from the 1911 encyclopaedia; ''This image has been released into the public domain by the author, or its copyright has expired. This applies worldwi