From a 1921 publication.
Photographer not named.
<cite class="book" style="font-style:normal">(in English) (1921) <i> <a rel="nofollow" class="external text" href="https://books.google.com/books?id=cnEFgMGoXd8C&amp;pg=PA69">A History of St. Olaf Choir</a></i>, Augsburg Publishing House, p. 69  <small></small></cite>