“The Humane Great Japanese Cross Medical Corps Tending to the Injured in the Russo-Japanese War” (Boston Museum of Fine Arts)
The Boston Museum of Fine Arts, like many museums today, have put images of many of their materials online. I just haven’t come to terms with how much is out there. If you go their collections page you can search for materials by keyword. For example, searching for “Russo-Japanese war” returns all kinds of beautiful works, including many not currently on display in the museum.
I especially appreciate their Image Rights page which emphasizes that if you cite the source, you are permitted to use the images for educational, personal, and non-commercial use, as per fair use. Compare that to the kinds of scare-language used by many other online photograph collections which don’t even mention or concede that such rights exist.