Vortaro de Esperanto
The Vortaro de Esperanto , published by Kazimierz Bein in 1911 , was the first monolingual dictionary ever published in Esperanto . 
<triplet> Vortaro de Esperanto <subj> Kazimierz Bein <obj> author <triplet> Kazimierz Bein <subj> Esperanto <obj> writing language