The sites you gave us to look at this week were interesting. They varied in historical content and some had more accessible information. I did notice that most of the sites did a good job siting the sources and giving credit to those who either were in the pictures or who took the pictures or their heirs. Archive.org was very helpful to find digital content that is free, but I wondered how the content is monitored.
Each of the sites were very useful and a great place to find information, but again how they keep up content monitoring seems to be something that could be a problem. There must be advertising or grants to keep the sites up to date and with in the confines of the law.