Legitimate SEO for such a keyword would target phrases like: "Erich von Gotha PDF warning" or "Understanding Erich von Gotha’s Twenty 2 – a critique."
Additional information regarding authorized retailers or other titles in this series can be provided if needed. Twenty 2 : Gotha, Erich von: Amazon.co.uk: Books erich von gotha twenty 2 pdf upd free
Look for publishers like NBM Publishing (under their Eurotica imprint), which historically handled his English translations. Legitimate SEO for such a keyword would target