The basis of this collection is the written legacy of Menno ter Braak, supplemented with letters from other legacies and archives held by the Letterkundig Museum (Literary Museum).

The Memory of the Netherlands provides access to letters to and from Menno ter Braak, autographs, typescripts and proofs of his work, cutout books, personal documents (like passports and printed advertisements) and photographs - covering almost all of Ter Braaks publishing activities.

The collection contains correspondence with (co-)writers, magazine editors and publishers like H. Marsman, J. Slauerhoff, D.A.M. Binnendijk, Constant Wessem, J. Greshoff, Anton van Duinkerken and Jan Engelman, historian J.H. Huizinga, German writer Thomas Mann, publishers Nijgh & Van Ditmar and A.A.M. Stols and many others.

Also available are manuscripts and proofs of Ter Braaks novels Hampton Court (1931) and Dr. Dumay verliest ('Dr. Dumay looses', 1933), as well as manuscripts and proofs of many of his essays and his principal essayistic works Carnaval der burgers ('Carnival of Citizens', 1930), Démasqué der schoonheid ('The Unmasking of Beauty', 1932), Politicus zonder partij ('Politician without a party', 1934) and Van oude en nieuwe christenen ('Of old and new Christians', 1937).