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During the 1818 census, Petros,ani had 233 inhabitants, while the entire Valley counted 2550. During this time, the main activity of the people was shepherding and no urban settlement had appeared yet.
Around 1840 coal surface mining began in Petros,ani, Vulcan and Petrila.
The population encountered a massive increase only in the 20th century during the communist regime, as many workers were brought in from other parts of the country. (Wikipedia)