Date	16/28 April 1866
Addressed to	Anatolii Tchaikovsky and Modest Tchaikovsky
Where written	Moscow
Language	Russian
Autograph Location	unknown
Publication	Жизнь Петра Ильича Чайковского, том 1 (1900), p. 239 (abridged) П. И. Чайковский. Письма к родным, том 1 (1940), p. 87–88 П. И. Чайковский. Полное собрание сочинений, том V (1959), p. 107–108.
Notes	Manuscript copy in Klin (Russia): Tchaikovsky House-Museum Archive.

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