From left to right: Frick, Nettlau and Friedeberg.

From left to right: Frick, Nettlau and Friedeberg.

From left to right: Frick, Nettlau and Friedeberg.
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https://iisg.amsterdam/id/item/693737

From left to right: Frick, Nettlau and Friedeberg.

From left to right: Frick, Nettlau and Friedeberg.
ImageObject
https://iisg.amsterdam/id/item/693737
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From left to right: Frick, Nettlau and Friedeberg.
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From left to right: Frick, Nettlau and Friedeberg.