 Author Piet Cleij collects the entries during his work on Interlingua dictionaries.The 263-page "Wörterbuch Deutsch–Interlingua" (WDI), with 45,000 to 50,000 entries, was compiled by André Schild.Schild, the first Secretary General of the Union Mundial pro Interlingua, held this post from 1955 to 1958.