Spedding, C. R. W. (1988). An introduction to agricultural systems (2nd edition.). Elsevier Applied Science.
Tohutoru Kātū ChicagoSpedding, C. R. W. An Introduction to Agricultural Systems. 2nd edition. London: Elsevier Applied Science, 1988.
Tohutoro MLASpedding, C. R. W. An Introduction to Agricultural Systems. 2nd edition. Elsevier Applied Science, 1988.
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