Columbia subject headings:
Hydraulic engineering--Russia (Federation)--Oka River Valley (Kurskai͡a oblastʹ-Nizhegorodskai͡a oblastʹ)--History.
Hydraulic structures--Russia (Federation)--Oka River Valley (Kurskai͡a oblastʹ-Nizhegorodskai͡a oblastʹ)--History.
Inland water transportation--Russia (Federation)--Oka River Valley (Kurskai͡a oblastʹ-Nizhegorodskai͡a oblastʹ)--History.
Oka River Valley (Kurskai͡a oblastʹ-Nizhegorodskai͡a oblastʹ, Russia)--History.
Steamboats--Russia (Federation)--Oka River Valley (Kurskai͡a oblastʹ-Nizhegorodskai͡a oblastʹ)--History.
Harvard subject headings:
Hydraulic engineering--Russia (Federation)--Oka River Valley (Kurskai︠a︡ oblastʹ-Nizhegorodskai︠a︡ oblastʹ)--History.
Hydraulic structures--Russia (Federation)--Oka River Valley (Kurskai︠a︡ oblastʹ-Nizhegorodskai︠a︡ oblastʹ)--History.
Inland water transportation--Russia (Federation)--Oka River Valley (Kurskai︠a︡ oblastʹ-Nizhegorodskai︠a︡ oblastʹ)--History.
Oka River Valley (Kurskai︠a︡ oblastʹ-Nizhegorodskai︠a︡ oblastʹ, Russia)--History.
Steamboats--Russia (Federation)--Oka River Valley (Kurskai︠a︡ oblastʹ-Nizhegorodskai︠a︡ oblastʹ)--History.
Princeton subject headings: