Pitman, G. 1973. A lichenometrical study of snow patch variation in the Frederikshåb district, South-West Greenland, and its implications for studies of climatic and glacial fluctuations. Bulletin Grønlands Geologiske Undersøgelse. 104, (Aug. 1973), 1–31. DOI:https://doi.org/10.34194/bullggu.v104.6645.