Julie Sweetkind-Singer, assistant director of Geospatial, Cartographic and Scientific Data & Services and head of the Branner Earth Sciences Library & Map Collections, published a convenient list of maps digitized and made available online by the Stanford Libraries.  The same resources were discussed in her recent talks at the 2016 Miami International Map Fair and at San Francisco's Roxburghe Club.

Topic Guide: Maps to the Masses
Julie's Miami Map Fair talk: Maps to the Masses: Content, Creation and Dissemination at Stanford