Aerial view (1,900 feet) of Balboa Park at the <a href="https://en.wikipedia.org/wiki/Panama-California_Exposition" class="extiw" title="en:Panama-California Exposition">1915 Panama-California Exposition</a> in San Diego, California.
W. E. Averrett
<i>Official View Book Panama-California International Exposition San Diego, California</i>, <a rel="nofollow" class="external text" href="https://archive.org/stream/C1002013157/c100_2013_157#page/n3/mode/1up">found at the Internet Archive</a>