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2. Dickens, J. A., B. C. Haynes, and W. F. Whitehead, 1976. A vacuum system for handling chicken hatchery waste. USDA Leaflet ARS-S-152.
3. Dickens, J. A., B. C. Haynes, and W. F. Whitehead, 1978. Automated waste-handling system for layer chicken hatcheries. USDA Leaflet ARS-S-186.
4. Gladys, G. E., and R. C. Smith, 1973. Waste disposal in delaware broiler hatcheries. Univ. Delaware Agric. Exp. Sta., Bull. 400.
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