Promotional image of Balboa Park for marketing 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.
C. T. Co. Publishers, Chicago
<i>San Diego and Vicinity, California.</i>, <a rel="nofollow" class="external text" href="https://archive.org/stream/C100Book201300210/c100_book_2013_00210#page/n7/mode/1up">found at the Internet Archive</a>