The Bulgarian landing tank ships according to a CIA report dated 27 September 1957

An item reported that the Bulgarian navy possessed six iron build double screw landing tank ships or Desandni Koramet-Bargia of which the origin was unknown but were described as outdated. The two diesel engines with screws allowed a speed of around 8-10 miles.

Source

The report was published on www.archive.org, document number CIA-RDP80T00246A037600210001-1