Unknown author<span style="display: none;">Unknown author</span> (The photographer is unknown and not mentioned in the source.)
before 9 August 1912 <div style="display: none;">date QS:P,+1912-08-09T00:00:00Z/7,P1326,+1912-08-09T00:00:00Z/11</div>
"Wiener Bauindustrie-Zeitung", XXIX. Jg., 1912, S. 373; 9. August 1912<br><a rel="nofollow" class="external free" href="http://anno.onb.ac.at/cgi-content/anno-plus?aid=wbz&amp;datum=1912&amp;page=405&amp;size=100">http://anno.onb.ac.at/cgi-content/anno-plus?aid=wbz&amp;datum=1912&amp;page=405&amp;size=100</a>