Beretning om et forbedret kaart over de Hetlandske Öer, : tilligemed trende blade med landtoninger og et speciel kaart over Valey-Sund paa Hetland. /
Søkortarkivet (Denmark)
Løvenørn, Poul,1751-1826.
Kiöbenhavn. : Trykt hos Frid. Wilh. Thiele.,
[1787].
A description of a new improved chart of the Shetland Isles which includes three plates depicting the Shetland coastline and a special chart of Vaila Sound (Valey-Sund) on the West Shetland Mainland and Gruting Voe.
Text signed at end (p. 16): P. de Löwenörn (Poul Løvenørn). Løvenørn was a Danish admiral and hydrographer who in 1784 became director of the newly-established Royal Danish Nautical Chart Archive.