Brepol Erhard. Jewelry Theory and Practice. In Russian/Brepol Erkhard. Teoriya i praktika yuvelirnogo dela. Second Stereotypical Edition. Translated from German by V.P. Kuznetsov. Edited by candidates of technical sciences, L.A. Gutov and G.T. Obolduev. -L-Machine Building 1975. 384s. Please contact us for details on condition of available copies of the book. SKUalb2f4162d7f946dfa7.