Konstantin Pavlovich - 27 April 1779 – 27 June 1831) was a grand duke of Russia and the second son of Emperor Paul I and Sophie Dorothea of Württemberg. He was the Tsesarevich of Russia throughout the reign of More
Lowering the pipe into an oil well. Baku. Опускание трубы в нефтяную скважину. Баку.
Sediment of the pipe into the well. Petroleum industry. Baku. Осадка трубы в скважину. Нефтяной промысел. Баку.
