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Johannes Franz Hartmann
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Johannes Franz „Juan” Hartmann (* 11. Januar 1865 in Erfurt; † 13. September 1936 in Chöttingen) weer en düütschen Astronom.
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Johannes Franz „Juan” Hartmann (* 11. Januar 1865 in Erfurt; † 13. September 1936 in Chöttingen) weer en düütschen Astronom.