Though not required of public domain images, if you want to credit the library as the source, please use the following statement: "From the San Francisco History Center, San Francisco Public Library" and provide a link back to the item on our Digital Collections site.
Text from negative sleeve: "Professor Krebs of Los Angeles, an organist, and friend of Daisy Kellum, enlisted in the Seventh Regiment. Here he is standing watching a firing detail drilling just outside the presidio grounds."