Konrad A. Kociszewski &amp; Darren D. DeWaele, Chicago Concrete Contractors, <a rel="nofollow" class="external free" href="http://www.chicagoconcretecontractors.com">http://www.chicagoconcretecontractors.com</a>, released by the author into public domain
<a href="https://en.wikipedia.org/wiki/User:Kocisz" class="extiw" title="wikipedia:User:Kocisz">Kocisz</a> at <a href="https://en.wikipedia.org/wiki/" class="extiw" title="wikipedia:">English Wikipedia</a>
14 May 2007 (original upload date)
Transferred from <span class="plainlinks"><a class="external text" href="https://en.wikipedia.org">en.wikipedia</a></span> to Commons.