1. Soils of the Great Plains;Aandahl,1972
2. Laboratory studies and genesis of a clay enriched horizon in the lowest part of the solum of some Brunizem and Gray-Brown Podzolic soils in Illinois;Bartelli,1960
3. Zur Bezeichnung von Bodenhorizonten;Blume,1976
4. A Study of the Morphology and Pedogenesis of a Medial Chernozem Developed in Loess;Bourne,1962
5. Fabric and Mineral Analysis of Soils;Brewer,1964