After entering the NDB around 1977, attempts were made to separate large archives from these; these have been coded as separate archives and included in the Overview: the Peiersen archive is one of these.
The Pietersen archive is not described in any detail and therefore hardly accessible for research. It can be viewed in its entirety by requests from the Pietersen archives, rd 1t/m ...A remnant of unidentifiable or difficult to identify items from the SWKOD estate in the "collection of SWKOD items" have been assembled and designated under SKWO no.1-23 (with gaps), see access-SKWO.
For the purpose of relocation, all former SWKOD records were packaged and coded. This was done rather globally; this added to the admixture that characterized the SWKOD material means that one must be aware that the former SKWOD archives may still be admixed.

The material condition of the records was (and is) extremely poor.