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1
by Podsosov, Aleksej Viktorovich
Published 1932
Uralʹskoe obl. gos. izd-vo
Subjects: “...Technology / Study and teaching (Primary) / Soviet Union...”
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2
Published 1941
Izd. red. detskogo veshchanija Krymradiokomiteta i Obl. stancii junykh tekhnikov i naturalistov
Subjects: “...Technological forecasting / Competitions / Ukraine / Crimea...”