An item referred to an anonymous informant who reported that he was not familiar with the topic mines but had heard that mines were laid by ships. The ones near the shore of Constanta, Romania were of the magnetic type, the ones at sea of the contact type.
Source
The report was published on www.archive.org, document number
CIA-RDP80-00809A000600020184-2
Source
The report was published on www.archive.org, document number
CIA-RDP80-00809A000600020184-2