SEARCH Articles Figures Tables Calix urea substituted Herbicide substituted urea Herbicides substituted urea types Polyurethane-urea substitution reactions Substituted urea herbicides, determination Substituted urea reaction Substituted ureas 1-naphthyl Substitution tetrasubstituted ureas Substitution ureas Substitution ureas Unsymmetrical tetra-substituted ureas Urea derivs formed by partial substitution (cont Centralite Urea substituted synthesis Urea, substituted, containing fluorine