812.SPb comments

08-May-2021 Saturday
I'm tired of chemistry. Help is needed. Help Pikabu

League of Chemists

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199833372

Water Chemistry Ecology

18-March-2021 Thursday
What, where and how is poured into the Miass River in Chelyabinsk

199830136

Video Water Pollution of the river Miass Negative Chelyabinsk Ecology

v20240901