Polish barges transporting coal to East Germany according to a CIA report dated

An item reporting that around 70 Polish barges-divided in increments of 5 barges and one tug- were used in the monthly transport of 46.000 tons of coal fro, Wroclaw [in the past called Breslau) towards Berlin-Klingenberg. The round trip takes around 2 weeks . After the delivery of the coal returned the barges empty.

Source
The report was published on www.archive.org, document number CIA-RDP80-0810A007600240007-8