Analysis of information sources in references of the Wikipedia article "Rudolf Koch" in English language version.
collected, drawn and explained by Rudolf Koch ; translated from the German by Vyvyan Holland. An unabridged republication of the English translation first published ... in 1930.
collected, drawn and explained by Rudolf Koch ; translated from the German by Vyvyan Holland. An unabridged republication of the English translation first published ... in 1930.