Orange and Romanov : letters from members of the Dutch royal family to their Russian relatives in the State Archive of the Russian Federation / Vincent Hovinga, Hans van KoningsbruggeLife and deeds of admiral Cornelius Cruys : (catalogue of documents of RGAVMF) / ed.-in-chief Hans van Koningsbrugge ; scientific ed. Vladimir S. Sobolev ; author Tamara P. Mazur ; assistant ed. Marcel Stoeten