Newspaper ad for Columbia Records releases featuring Al Jolson in blackface, on page 6 of the February 10, 1920 <i>Duluth Herald</i>.
Columbia Gramophone Company
<a rel="nofollow" class="external text" href="https://archive.org/details/duluthherald2281920unse"><i>The Duluth Herald</i> (Feb. 1920)</a> at the Internet Archive