Weekly `Personnel Manager's Reports, Season 1951-52; Weekly listing of men who missed rehearsals and/or concerts due to illness, bereavement, etc.; List of extra musicians; problems with behavior of individual orchestra members; musicians missing rehearsals and concerts due to illness; letters from doctors treating ill musicians; list of orchestra personnel for the season; out-of-town concerts; large number of extra musicians for Mahler Symphony No. 1 (Mitropoulos), Moussorgsky "Pictures at an Exhibition" (Cantelli), Philip Clapp Symphony No. 8 (Mitropoulos), Wagner excerpts (Walter); problems in violin section; Guido Cantelli problems with members of the orchestra at rehearsal on 2 January 1952, walked off stage, returned after Mitropoulos addressed the orchestra