Searching for Chinese Cultural Revolution Photos

Feb 2019
Oregon, USA
Greetings everyone!

I've come seeking help - I'm working on a research project on China under Mao, particularly the '66-'76 Cultural Revolution. I'm trying to track down photo archives, or some sort of repository, for photos from the time. Looking for anything extensive and high-resolution. I've been scouring the internet but could use help if anybody knows of a source for media such as this.

Thank you.