He wrote Gramat Volapüka, a grammar of the language completely in Volapük, and a German-Volapük dictionary, Wörterbuch der Weltsprache (World Language Dictionary).
Ia menulis Gramat Volapüka, tata bahasa Volapük, dan kamus Jerman-Volapük, Wörterbuch der Weltsprache (Kamus Bahasa Dunia).