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| 3 | Wright, P. 1999. Earthen Manure Storage Design Considerations NRAES-109. Natural Resource, Agriculture and Engineering Service (NRAES). Ithaca, New York. |
| 4 | Dougherty, M., L.D. Geohring, P. Wright. 1998. Liquid Manure Application Systems Design Manual, NRAES-89. Natural Resource, Agriculture and Engineering Service (NRAES). Ithaca, New York. |
| 5 | Porter, M.J. 1997. Nutrient Management: Crop Production and Water Quality, NRAES-101. Natural Resource, Agriculture and Engineering Service (NRAES). Ithaca, New York. |