But the collection also boasts numerous letters by Dutch, Belgian, German, Swiss, English, Italian, Spanish, Scandinavian and American artists. Important files concern the Schnorr von Carolsfeld family and Max Liebermann, while a bequest from the artist Dimitri Bouchène (1893-1993) brought important material by Russian artists such as Ilja Repin, Mark Antokolski and Alexandre Benois to the collection. With the correspondence from Piet Mondrian and Theo van Doesburg to the architect J.J.P. Oud, both running to a hundred of letters, the Fondation also holds material of great significance from the twentieth century.