The book, “Adolf Hitler: His Life and His Speeches,” was credited to Baron Adolf Victor von Koerber, a German aristocrat and war hero. Scholars have said that Hitler sought Mr. von Koerber out for the biography because he needed a conservative figure without links to the Nazi Party to help legitimize him as a leader.

However, new research says Hitler penned the work himself. This suggests that Hitler had designs on taking power earlier than many historians have previously thought and manipulated public opinion to get there.

“Adolf Hitler: His Life and His Speeches” was published two years before “Mein Kampf,” the autobiography and manifesto that historians consider the moment Hitler went from political propagandist to leader in waiting.