Date	28 February/12 March 1878
Addressed to	Nadezhda von Meck
Where written	Clarens
Language	Russian
Autograph Location	Klin (Russia): Tchaikovsky House-Museum Archive (a3, No. 3133)
Publication	Жизнь Петра Ильича Чайковского, том 2 (1901), p. 124–125 (abridged) П. И. Чайковский. Переписка с Н. Ф. фон-Мекк, том 1 (1934), p. 231–233 П. И. Чайковский. Полное собрание сочинений, том VII (1962), p. 148–149 To my best friend. Correspondence between Tchaikovsky and Nadezhda von Meck (1993), p. 196–197 (English translation) (abridged)..

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