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https://picclick.de/52649313-8729-Koenigsberg-Marktplatz-Rathaus-Regiomentanus-Brunnen-Gasthaus-302730909683.html
http://www.google.de/url?url=http://www.byzant.com/Mystical/Astrology/Houses.aspx
https://archive.org/stream/diepreussenaufd00freygoog/diepreussenaufd00freygoog_djvu.txt
http://www.google.de/url?url=http://www.archive.org/stream/cosmosasketchap03humbgoog/cosmosasketchap03humbgoog_djvu.txt
https://www.scribd.com/doc/44422861/Na-Idade-Da-Pedra-Lascada
https://www.academia.edu/36979928/O_tratado_SCRIPTA_CLARISSIMI_MATHEMATICI_1469_uma_possibilidade_de_documento_hist%25C3%25B3rico_envolvendo_instrumentos
http://www.google.de/url?url=http://caimbhriainmyrddin.blogspot.com/2010/03/houses-in-astrology.html