According to the exhibit caption: "<i>Official and Historical Atlas Map of Alameda County, California</i>, Thompson &amp; West, Oakland, California, 1878, page 124."
Thompson &amp; West (photo by <a href="//commons.wikimedia.org/wiki/User:King_of_Hearts" title="User:King of Hearts">King of Hearts</a>)
<a href="https://en.wikipedia.org/wiki/Mission_San_Jos%C3%A9_(California)" class="extiw" title="w:Mission San José (California)">Mission San Jose</a> Museum