Copper in animal wastes and sewage sludge : proceedings of the EEC workshop organised by the Institut national de la recherche agronomique (INRA), Station d'agronomie, Bordeaux, France, and held at Bordeaux, October 3-10, 1980 - Dehandtschutter, J. (Jacques); L'Hermite, P. (Pierre), 1936- (D. Reidel, 1981)