Primary Sources and Comparison

Sources:
Digital Inquiry Group (formerly SHEG) has some good collections of sources, which sometimes include visual sources. The DBQ Project also has some useful collections that go beyond DIG's sources. For visual sources, sometimes I find universities or museums that have relevant collections curated. For example, MIT has a collection of visual images that I use for Commodore Perry and the opening of Japan:  https://visualizingcultures.mit.edu/black_ships_and_samurai/index.html. 

Sources:
Digital Inquiry Group (formerly SHEG) has some good collections of sources, which sometimes include visual sources. The DBQ Project also has some useful collections that go beyond DIG's sources. For visual sources, sometimes I find universities or museums that have relevant collections curated. For example, MIT has a collection of visual images that I use for Commodore Perry and the opening of Japan:  https://visualizingcultures.mit.edu/black_ships_and_samurai/index.html.