1. Wiegner G. , and Pallmann H. , 1929. “Hydrogen- and Hydroxyl-ion Swarms on Suspended Particles,” Proc. II Com. Int. Soc. Soil Sci., B, 92.
2. An Account of the Northside of the Coast of Buchan;Troup;Scot. Hist. Soc.,1907
3. Read H. H. , 1923. Mem. Geol. Surv. Scot., Explanation of Sheets 86 and 96.
4. The Soils of Scotland;Ogg;Emp. Journ. Exp. Agric.,1935