Dubrovsky Nikolai Andreevich. Military service in the Latvian army in 1930-32.

Valve of antique traction engine, early 20th century
1920s, 1930s, part of self-propelled steam engine used to plough (plow) ground....
Life in Riga in 1930's
Dubrovsky Nikolai Andreevich and Maria Vasilievna...
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