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2349. Hae, F.K.. 1981. Climate's impact on food supplies: Can it be identified?. L.E. Slater and S.K. Levin (eds.). Climate's impact on food supplies. p. 9.
2617. Hill, K.W.. 1954. Wheat yields and soil fertility on the Canadian prairies after a half century of farming.. Soil Sci. Soc. Am. Proc. 18:182-184.
T: soil properties X rotation; wheat yields X time