Tipping R, Davies A, Tisdall E & Reid E (2004) Between a rock and a hard place: the persistence of people in the Scottish Highlands. Earth Heritage, (21), pp. 22-23. http://www.earthheritage.org.uk/ehpdf/EH-21.pdf
Mountain landscapes are the harshest environments in the British Isles from which to make a living. In fact,most interpretations have emphasised the ephemeral nature of settlement, that life was frequently too much of a struggle against intractable soils and climates.
Earth Heritage, Issue 21