“Как довести покупной телескоп до ума и сделать из него астрограф.“ - Иван Ионов.АстроФест - 2019
АстроФест - 2019 , “Как довести покупной телескоп до ума и сделать из него астрограф.“Теоретическая часть - Иван Ионов.
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