Sketch of construction work on the Yamhill river lock and dam
Unknown author<span style="display: none;">Unknown author</span>
<a rel="nofollow" class="external text" href="http://oregonnews.uoregon.edu/lccn/sn83025138/1900-09-22/ed-1/seq-1/">Morning Oregonian, September 22, 1900, page 1</a>