Typewriter script. Translated from the German and reprinted from 'Deutscher Ausschuss für Stahlbeton', 1952. no.107.
Non-destructive testing of concrete by the steel ball impact method : an abridged translation of Report no.107 of German Select Committee for Reinforced Concrete by Kurt Gaede. Published by Cement & Concrete Association in 1953. Publication and catalogue information, links to buy online and reader comments.