Walton et al., 1977. Agric. Eng., 58 (6): 15-16 Document reference Walton, H. V. ; Vandepopuliere, J. M. ; Jaynes, W. ; Cotterill, O. J., 1977. Using eggshells in poultry feed. Agric. Eng., 58 (6): 15-16Citation key Walton et al., 1977Datasheets Eggshells
