The original novel was published in 1972 (it was written 1966-67).

Soviet science fiction novel by the Strugatsky brothers.
Published
1972
Original title
Гадкие лебеди (aka Время дождя)
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Author

Boris Strugatsky

The brothers Arkady (1925-1991) and Boris (1933-2012) Strugatsky were Soviet-Russian science fiction authors who collaborated on their fiction.