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Frá sjálvstýri móti loysing: donsk-føroysk viðurskifti frá 1906 til 1925 við serligum atliti at radikaliseringini av tjóðskapar-og sjálvstýrisspurninginum
Kopierrahmen mit elektronischer Regelvorrichtung der Belichtungszeit und unabhaengiger elektronischer Regelvorrichtung zur Steuerung eines Zusatzlichtes zwecks Gradationswandlung von Kopiermaterialien