had their populations increase five-fold or more
... that the German cities of Duisburg, Essen, and Kiel all had their populations increase five-fold or more between 1875 and 1910?
... that the German cities of <a href="./Duisburg" id="mwA40" rel="mw:WikiLink" title="Duisburg">Duisburg</a>, <a href="./Essen" id="mwA44" rel="mw:WikiLink" title="Essen">Essen</a>, and <a href="./Kiel" id="mwA48" rel="mw:WikiLink" title="Kiel">Kiel</a> all <b id="mwA5A"><a href="./Urbanization_in_the_German_Empire" id="mwA5E" rel="mw:WikiLink" title="Urbanization in the German Empire">had their populations increase five-fold or more</a></b> between 1875 and 1910?