Date	19/31 March 1878
Addressed to	Nadezhda von Meck
Where written	Clarens
Language	Russian
Autograph Location	Klin (Russia): Tchaikovsky House-Museum Archive (a3, No. 3143)
Publication	Жизнь Петра Ильича Чайковского, том 2 (1901), p. 140–143 (abridged) П. И. Чайковский. Переписка с Н. Ф. фон-Мекк, том 1 (1934), p. 266–270 П. И. Чайковский. Полное собрание сочинений, том VII (1962), p. 186–190 To my best friend. Correspondence between Tchaikovsky and Nadezhda von Meck (1993), p. 223–226 (English translation) (abridged)..

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