The Erich Maria Remarque Archive at the Erich Maria Remarque-Peace Center (Erich Maria Remarque-Friedenszentrum) in Osnabrück houses correspondence between Ruth Marton and Erich Maria Remarque from the years 1939-1970. Their collection is comprised of 82 letters by Remarque to Ruth Marton, 85 letters of Ruth Marton to Remarque, 3 other letters, 7 photographs, and 112 newspaper clippings
Correspondence of Ruth Marton and the Austrian writer Alexander Lernet-Holenia is not represented in this collection, for Ruth Marton donated these letters to the Austrian National Library (Oesterreichische Nationalbibliothek), where it is part of the collection Teilnachlaß Ruth Marton. The Austrian National Library holds 382 letters addressed to Ruth Marton and 94 letters by her, mostly to Alexander Lernet-Holenia from the span 1936-1976