Esperanto - Stamp Centenary - Airmail
Esperanto
Esperanto Domo Arnhem
Esperanto F.L.E. Heerlen
Esperanto - S.A.T. Congress Amsterdam
Esperanto - 100 years of international language
Esperanto Congress
Esperanto Jubilee Congress
Esperanto Congress Oostende
Esperanto Congress Haarlem
S.A.T. Esperanto Congress Amsterdam
I.K.U.E. Esperanto Congress The Hague
F.L.E. Esperanto Congress Heerlen
Esperanto - S.A.T. Congress Amersfoort
International Esperanto Congress Haarlem
Esperanto Congress Den Haag
Esperanto - S.A.T. Congress Rotterdam
