Wehrli Leo Prahova fotos - ETH Bibliothek Zürich Bildarchiv

Ploiesti, von sudost, panorama, 1935

 Baicoi bohrturme, 1936

Derricks and an above ground pipeline with arches for vehicles to pass under in Baicoi, 1936

Ploiesti Petrol Brand, 1935

Campina Erdol Reffinerie, 1935