1. MUS RP 7145 Reference (shelfmark): MUS RP 7145 Title: Scope & Content: TCHAIKOVSKY, Piotr. Autograph letter signed to Ekaterina Ivanovna Laroche. Creation dates: 19 January 1893. Collection Area: Music Collections Languages: Russian Date Range: 14 Jul 2014 Extent: 4 photocopy sheets