Het Letterkundig Museum (Literary Museum) collects and manages archives and collections of Dutch writers and publishers since 1750. The collection of the museum consists of numerous letters, manuscripts, typescripts, proofs, reprints and newspaper clippings. Furthermore, the museum holds painted, drawn and photographed portraits of writers, as well as book illustrations and objects like Simon Vestdijks vacuum cleaner and Jan Hanlo's motor helmet.

The collection Menno ter Braak on the website of the Memory of the Netherlands offers access to over 700 letters, autographs, photos and other (personal) documents, mostly from Ter Braak's written legacy.

During the interbellum years, Menno ter Braak (1902-1940) had a huge influence on the intellectual life in the Netherlands. Besides being a writer, Ter Braak was a perceptive essayist and a very well-read cultural and literary critic. With E. du Perron and Maurice Roelants he founded literary magazine Forum.