James, D., Dow, A. Source and degree of soil variation in the field. Washington: 1972 11 p. : ill.
James, D., Dow, A. Source and degree of soil variation in the field. Washington: 1972 11 p. : ill.
James, D., Dow, A. (1972) Source and degree of soil variation in the field, Washington: 11 p. : ill.
James, D., & Dow, A. (1972). Source and degree of soil variation in the field. The problem of sampling for soil tests and estimating soil fertility status. Washington: 11 p. : ill.
James D, Dow A. Source and degree of soil variation in the field: The problem of sampling for soil tests and estimating soil fertility status. Washington: 1972. p. 11 p. : ill.
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