Category:Johann Jürgen Callsen

**Johann Jürgen Callsen**
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Date of birth	14 September 1831
Date of death	29 September 1919
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	Q118792774; VIAF ID: 309614669; GND ID: 1053077521
	Reasonator; Scholia; Wikidocumentaries; PetScan; statistics; WikiMap; Locator tool; KML file; Search depicted;

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