Nat, Yves. (1890 - 1956) Collection of Autograph Letters and PoetryFour Autograph Letters and a poem manuscript from the French virtuoso pianist and composer to Robert Krettly, the violinist and founder of the avant garde quartet "Quatuor Krettly." 1.) ALS, postmarked 9 April 1918, 1 page. Written to Krettly while stationed in Rouen as a Sargeant. Nat is advising Krettly about his next move after the end of the First World War: "J'imagine que vous irez vivre Paris. Et cela evidemment m'est une tristesse. Mais je