Aerial view of the top deck of the Niagara Falls Suspension Bridge as it undergoes conversion into the Lower Steel Arch Bridge
Unknown author<span style="display: none;">Unknown author</span>
1897-06-04
<cite style="font-style:normal">Buck, Richard (December 1898). "<a rel="nofollow" class="external text" href="https://archive.org/stream/transactionsofam40amer#page/n178/mode/1up">The Niagara Railway Arch</a>". <i>Transactions of the American Society of Civil Engineers</i> <b>40</b> (836): Plate X. New York: American Society of Civil Engineers. Retrieved on <span class="mw-formatted-date" title="2009-07-10">2009-07-10</span>.</cite>