File:PSM V58 D020 Photographic refracting telescope at potsdam.png

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English: Photographic refracting telescope at Potsdam
Date between 1900 and 1901
date QS:P,+1900-00-00T00:00:00Z/8,P1319,+1900-00-00T00:00:00Z/9,P1326,+1901-00-00T00:00:00Z/9
Source Popular Science Monthly Volume 58
Author Unknown authorUnknown author

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