Julia Isbrücker

[6] Isbrücker was also a member of an examination committee, a member of the International Central Committee (ICK), president of the Hague Esperanto club "Fine ili venkos", she led courses and gave lectures in various non-Esperanto circles.

In 1939 she became secretary of a newly founded Dutch Committee for the practical application of Esperanto, whose members were the mayor of The Hague and directors of a bank, a tourist office, PTT, Philips and KLM.

With Andreo Cseh she founded the Universal League, a world federation based on the work of Clarence K. Streit.

In the meantime she wrote and translated extensively, primarily for the newspaper The Practice, which she collaborated with since its founding in 1932 and which became the official organ of the Universal League.

In 2020 a commemorative silver coin with the portrait of Julia Isbrücker was issued by Walter Klag, Austria, with a value of 50 steloj.