Three-view drawing of De Havilland DH.34 with 450 hp Napier Lion engine.
<i>Flight</i>
1922-01-05
<a rel="nofollow" class="external text" href="https://www.flightglobal.com/pdfarchive/view/1922/1922%20-%200004.html"><i>Flight</i>, vol. XIV, no. 1, p. 4, "The D.H. Type 34 Commercial Biplane".</a>