1. Aitchison J (1986) The statistical analysis of compositional data. Chapman and Hall Ltd., London (Reprinted in 2003 by the Blackburn Press)
2. Amundson R (2005) Soil formation. In: Drever J, Holland H, Turekian K (eds) Surface and groundwater, weathering, and soils, treatise on geochemistry, vol 5. Elsevier Ltd, Oxford
3. CEC (Commission for Environmental Cooperation) (1997) Ecological regions of North America—toward a common perspective. Commission for Environmental Cooperation, Montreal
4. Chayes F (1960) On correlation between variables of constant sum. J Geophys Res 65:4185–4193
5. Chipres J, de la Calleja A, Tellez J, Jimenez F, Cruz C, Guerrero E, Castro J, Monroy M, Salinas J (2009) Geochemistry of soils along a transect from Central Mexico to the Pacific Coast: a pilot study for continental-scale geochemical mapping. Appl Geochem 24:1416–1428. https://doi.org/10.1016/j.apgeochem.2009.04.012