Zapiska XXXI [i.e. trid︠t︡satʹ pervomu] sʺ︠i︡ezdu gornopromyshlennikov ︠i︡uga Rossīi po 12-mu voprosu programmy : obsuzhdenīe voprosov, otnos︠i︡ashchikhs︠i︡a k rabochemu zakonodatelʹstvu - Ditmar, N. F. fon (Nikolaĭ Fedorovich) (Russian history and culture, 1906)