Diagrammatic map of Ny Friesland to show the outcrops of the main stratigraphical divisions of the Lower Hecla Hock.
Oslo :  Norsk Polarinstitutt, 
1969.
In: The Geology of the Femmilsjoen region of north-west Ny Friesland, Spitsbergen. By R.A. Gayer.
Norsk Polarinstitutt Skrifter Nr. 145, p. 6.