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English: Nicolaus Copernicus' letter in German to Duke Albrecht of Prussia, dated 25 June 1541. Reproduction of the manuscript, as taken from w:Leopold Prowe's (1821-1887) Nicolaus Coppernicus, 1884, Tafel III. For Prowe's transscription of two letters, see File:Copernicus-an-Herzog-Albrecht.djvu, in Dvju-format for use in German Wikisource at s:de:An den Herzog Albrecht von Preussen.
Date XV. Junii 1541
Author Nicolaus Copernicus


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