Prahova Valley oil wells

Oil wells on the river Prahova.

Rumänien Prahova Valley - Campina - Sonde - Öl Förderung.
Prahova oil wells-1922 .

Die petroleumquellen bei Campina

Prahova Valley oil wells in 1926.

Prahova Valley ,Campina,romanian oil wells.

Oil wells on Prahova Valley in 1949.

Oil wells at Campina in 1906.

Extraction du petrol-Prahova, Roumanie -1939 .