Picryl description: Public domain image of a political campaign, politician, meeting, 1930s, mid-20th-century United States, free to use, no copyright restrictions.
Public domain photograph of laboratory, science, research, free to use, no copyright restrictions image - Picryl description
Public domain photograph of laboratory, science, research, free to use, no copyright restrictions image - Picryl description
Public domain photograph of California in 1930s, free to use, no copyright restrictions image - Picryl description