Here are some photos used for advertising, from the USC archives.
An apple a day, ad campaign, 1940
Belcher School and radio, Southern California, 1929
Belcher School and radio, Southern California, 1929
Billie Barnes, ad for Stewart-Warner Radio, Southern California, 1927
Couples dancing, coffee ad, 1930
Dog team, Frank Price Tires, Los Angeles, 1933
[this is one of the most surreal publicity campaigns I've ever seen]
Girl and man eating ice cream cone, Southern California, 1932
Betty Baker, ad campaign, Southern California, 1927
Campaign shots for publicity, Immaculate Heart College, Southern California, 1929