"Justus Perthes Publishers (German: Justus Perthes Verlag) was established in 1785 in Gotha, Germany. Justus Perthes was primarily a publisher of geographic atlases and wall maps. ...
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He published "Petermanns Geographische Mitteilungen" and also the Almanach de Gotha (Gothaischer Hofkalender). In 2016 the publisher was discontinued." - (en.wikipedia.org 11.08.2021)
