Provenance
NPIC Basic Imagery Interpretation Report RCA-03/0011/69; declassified via the CIA FOIA Reading Room (CIA-RDP78T04563A000100010027-3). A work of the US government - public domain.
First page - click to open full document
The third act of the arc that began with the empty-handed 1965 search: by February 1969 the National Photographic Interpretation Center could publish a Basic Imagery Interpretation Report on the troposcatter facility at Dudinka itself, the one town of the original three that the March 1966 count had not yet caught. Three pages, filed under “Deployed Comm/Elec/Radar Facilities, USSR.”
Taken together, the three documents are a time-lapse of intelligence catching up with construction: a tip in 1965, a fifteen-site inventory in 1966, a routine per-facility report by 1969. By then the Север line was operational and Dudinka was just another entry in the deployed-facilities file.
Source: CIA FOIA Reading Room (archived). Public domain as a US government work; declassification by NGA/DoD.