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| Sorochan, J. C. 1999. Michigan State University Sod Producers Field Day. p. 17.
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| Sorochan, J. C. 1999. Michigan State University Sod Producers Field Day. p. 17.
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| Nitrogen and potassium rates and ratios for Supina bluegrass
| Sorochan, J. C. 1999. Michigan State University Sod Producers Field Day. p. 17.
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