Ludwik Maurycy Landau
... that during World War II, Polish-Jewish economist Ludwik Maurycy Landau conducted undercover research into the economic conditions in occupied Poland?
... that during World War II, Polish-Jewish economist <b id="mwB9Y"><a href="./Ludwik_Maurycy_Landau" id="mwB9c" rel="mw:WikiLink" title="Ludwik Maurycy Landau">Ludwik Maurycy Landau</a></b> conducted undercover research into the economic conditions in <a href="./Occupation_of_Poland_(1939–1945)" id="mwB9g" rel="mw:WikiLink" title="Occupation of Poland (1939–1945)">occupied Poland</a>?