https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse English French Germana Esperantisto - Januaro 1925...
https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse English French Germana Esperantisto - Aŭgusto-Septembro 1931...
https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse English French Heroldo de Esperanto - 28 Januaro 1925...
https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse English Pola Esperantisto - Februaro 1934...
Bulteno de Ellersiek Borel aprilo 1925.pdf Esperanto: Anonca Bulteno de Ellersiek & Borel, aprilo 1925 Date April 1925 Source KUL Author Friedrich Wilhelm...
DescriptionEnciklopedio de Esperanto, 1933.pdf Esperanto: Enciklopedio de Esperanto de 1933 Date 1933 Source https://dlibra.kul.pl/dlibra/publication...