Maps can be useful to contextualize stories.
Here are some starting places:
Digital Sanborn Fire Insurance Maps:
http://sanborn.umi.com/Detailed maps of streets, businesses, and other information created for fire insurance purposes ~1880-1920, subscription provides access to California cities.
Calisphere Maps:
https://calisphere.org/search/?q=MapsDavid Rumsey Map Collection:
https://www.davidrumsey.com/ The historical map collection has over 55,000 maps and images online. The collection focuses on rare 18th and 19th century North American and South American maps and other cartographic materials. Historic maps of the World, Europe, Asia, and Africa are also represented.
For more maps, check out:
http://guides.lib.calpoly.edu/GIS/HGIS