Letter, 3 December 1922, Czechoslovakia, Johannes and Julia Rontgen to Mary Grierson. Describing their new environment, and Johannes new job to Grierson. Holograph signed.

Letter, 30 March 1922, Amsterdam, Johannes Rontgen to Mary Grierson. expressing delight at news of Miss. Weisse's travels, suggesting he meet up with the Rontgens' in Holland, describing memories of Edinburgh, asking Miss. Weisse about the Reid orchestra, suggesting Bartock is the best modern composer living, and best wishes. Holograph signed.

Letter, 16 July 1922, Johannes Rontgen to Mary Grierson. Informing Mary Grierson that the Rontgen's will not be coming to Edinburgh since Johannes has accepted a conducting post and news of his wedding. Holograph signed.

Letter, 19 March 1924, Amsterdam, Johannes Rontgen to Mary Grierson. Thanking Grierson for sending an Easter Egg, comments on the improvement of the Reid orchestra and best wishes. Holograph signed.

Letter, 26 August 1932, Northumberland, Johannes and Julia Rontgen to Donald Tovey. Concern over Tovey's health, news of composition work and of performing the compositions. Holograph signed.

Letter, 6 August 1936, Holland, Johannes and Julia Rontgen to Donald Tovey. News of journey to Holland, of Nicholas Roth's knowledge of Tovey's Haydn trio's, congratulating Tovey on the fine melody and beautiful harmony he has made of the Newman Hymn. Holograph signed.

Letter, 14 December 1923, Johannes [ Rontgen], to Donald Tovey. Discussing Rontgen's plans to play and conduct Tovey's concert in Edinburgh, asks about a performance of ' Euryanthe ' in Dresden and inform Tovey that he has played with Hindemith and Zemlinsky. Holograph signed.

Letter, 19 January 1924, Johannes Rontgen to Donald Tovey. Thanking Tovey for sending a Dohnanyi score, describing a performance of a work by Hindemith and discussing the financial state of Germany. Holograph signed.

Letter, 24 October 1907, Amsterdam, Johannes Rontgen to Donald Tovey. Discussing forthcoming concerts and a Brahms festival, describing compositions Rontgen has written for violin and flute. Holograph signed.

Letter, 6 July 1933, Canton De Vaud, Johannes Rontgen to Sophie Weisse. Informing Miss. Weisse that Rontgen has been invited to work as co-conductor of an orchestra in Czechoslavakia and thanking Tovey for attending Rontgen's wedding and gift. Holograph signed.