Ekho
Subtitle: ekologiya, khozyaistvo, okruzhayushchaya sreda = ecology, economy, environment.
By: pod redaktsiei A.I. Kozyreva i A.M.Kostina.
Contributors: Kozyrev, A. I.; Kostin, A. M.
Publisher: Progress
Published: 1990
Place of publication: Moskva
Language: rus