Blar i Riksantikvarens vitenarkiv på forfatter "Helskog, Knut"
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Report: Second mission to Nokalakevi, November 2010 (English ed.)
Hygen, Anne-Sophie; Helskog, Knut (Others, 2010) -
Report: Seventh mission to Sarmishsay, April/May 2009 (English ed.)
Hygen, Anne-Sophie; Helskog, Knut (Research report, 2009) -
Report: Seventh mission to Sarmishsay, April/May 2009 (Russian ed.)
Hygen, Anne-Sophie; Helskog, Knut (Research report, 2009)