Charles B. Hoeven (Iowa Congressman)
US Government Printing Office (Washington, DC), publisher.
<a rel="nofollow" class="external text" href="https://babel.hathitrust.org/cgi/pt?id=msu.31293012373860;view=1up;seq=59;size=150">"Pocket Congressional Directory of the Eighty-Eighth Congress"</a>.  1963.  Page 51