The collection also includes letters van Gogh wrote to his sister Wil and other relatives, as well as between artists such as Paul Gauguin, Anthon van Rappard and Émile Bernard.
Koleksi tersebut juga meliputi surat-surat van Gogh yang ditulis kepada saudarinya Wil dan para kerabat lainnya, serta antara para seniman seperti Paul Gauguin, Anthon van Rappard dan Émile Bernard.