Bulgarian motor tug active on the Danube according to a CIA report dated 31 July 1952

An item dealing with the merchant shipping traffic on the Danube between 25 February and 28 March 1952 between Vienna, Austria and Reni, Ukraine [45˚26’North and 28˚18’East] mentioned an anonymous Bulgarian motor tug towing 4 tank and 6 cargo barges.

Source
The report was published on www.archive.org, document number CIA-RDP82-00457R013800340010-5