Diagrammatic map to show areas of outcrop of Harkerbreen group (of Ny Friesland and Olav V Land, Spitsbergen).
Oslo :  Norsk Polarinstitutt, 
1966.
In: The Petrology of the Harkebreen Group of the Lower Hecla Hock of ... Spitsbergen. By R.A. Gayer and R.H. Wallis.
Norsk Polarinstitutt Skrifter Nr. 140, p. 6.