Malin exchanged hundreds of letters with her parents, as well as corresponding frequently with friends and colleagues. Sub-series in this series include letters to Malin from her parents, from Malin to her parents, to Malin from her friend Cecelia Eichenberg, and to Malin from other friends.

The correspondence is arranged in folders by year, but not necessarily by month or date. Correspondence sent from some particular friends has been grouped by their name and year sent.