viaf :
https://viaf.org/viaf/221691449
Porkelsson, Friðþjófur
(1932 – 2008)
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Litir íslenska hestsins / The colours of the Icelandic horse / Die Farben des Islandpferdes / Islandshestens farver.
Reykjavík, Mál og Menning, 2006.
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The Icelandic horse and its colours.
Seltjarnarnes-Reykjavík, Ormstunga, 1993.