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Henri La Fontaine and Ludwig Quidde at the opening session of the XXIIIrd Universal Peace Congress in the Reichstag Room, Berlin, 1924.
Mundaneum. Public domain, via Wikimedia Commons. Photography Continental Photo, Berlin.
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2 (of 2)
World Peace Congress in Munich 1907: Bertha von Suttner (seated row, second from left), Ludwig Quidde (next to the right), Frédéric Passy (next to the right), Henri La Fontaine (to her right) and A. H. Fried (standing row, third from the right).
Photographer unknown. Public domain, via Wikimedia Commons.