Björn Þortsteinsson ; editor, Ásgier S. Björnsson ; selection of photographs, Örlygur Hálfdanarson ; with a contribution on the Thingvellir Lake by Sigurjón Rist and on plant life at Thingvellir by Ingólfur Daviđsson ; English version by Peter FooteÖrn og Örlygur1987