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SOPHER, C. D., MCCRACKEN, R. J., & MASON, D. D. (1973). [Review of RELATIONSHIPS BETWEEN DROUTH AND CORN YIELDS ON SELECTED SOUTH-ATLANTIC COASTAL-PLAIN SOILS]. AGRONOMY JOURNAL, 65(3), 351–354. https://doi.org/10.2134/agronj1973.00021962006500030003x

SOPHER, C. D., & MCCRACKEN, R. J. (1973). RELATIONSHIPS BETWEEN SOIL PROPERTIES, MANAGEMENT PRACTICES, AND CORN YIELDS ON SOUTH-ATLANTIC COASTAL-PLAIN SOILS. AGRONOMY JOURNAL, 65(4), 595–599. https://doi.org/10.2134/agronj1973.00021962006500040020x