1. Actual and potential yields of wheat and barley in the United Kingdom;Austin;ADAS Q. Rev.,1978
2. Soil type and crop performance;Avery;Soils Fertil. Abstracts,1962
3. Soil classification in the Soil Survey of England and Wales;Avery;J. Soil Sci.,1973
4. The utility of field experiments;Barley;Soils Fertil. Abs.,1964
5. Soil variability: a review;Beckett;Soils Fertil. Abs.,1971