Title: Masovo vnedri︠a︡vane na sistemata za neprekŭsnato tekhnichesko obsluzhvane ot ekipazhite na parakhodstvo Bŭlgarski morski flot--Varna i parakhodstvo Bŭlgarsko rechno plavane--Ruse
Subjects: Bŭlgarsko rechno plavane, Bŭlgarski morski flot, Maintenance and repair, Inland waterway vessels, Steamboats
Places: Varna, Ruse, Bulgaria