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Исследование водных объектов (apr 15, 1919 – apr 15, 1941)
Description:
Количество гидропостов на реках и озерах республики выросло до 170. На них проводились наблюдения за уровнем воды и гидро- логическим режимом.
Added to timeline:
География
By
Ирина
11 Nov 2019
0
0
418
Date:
apr 15, 1919
apr 15, 1941
~ 22 years
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