How would you like to have some nice historical photos like the ones above to illustrate your web site or presentation.
These days many institutions are digitizing their collections and making them available on line. I found those above at The Online Archive of California. http://www.oac.cdlib.org/search.image.html
They have many dozens of photos on site and I was able to find these and more by doing keyword searches like African, panther, colored, segregation, Watts, you get the idea. Many have copyright but allow fair use. That is they may be used for non-commercial purposes.
Many of the older ones are by unknown photographers, many also come with info about who the photographer was along with a brief summary of the photograph. From an historical viewpoint there are photos of notable people from the Black community such as Black Panther Huey Newton, Marcus Garvey, Booker T washington, Mohammed Ali and many more. Even if you're not a history buff you'll really enjoy the photos or you can use some of them for a project. Go and dig around, you never know what you might find.