Photogrpahy in ww1

Hi, my brother is doing a paper for his College about photography.

He knew I was big on ww1 and ww2 and asked me to help him out with photography in wars.

I have given him alot of stuff about recon flights and types of planes etc...

But I need more...Does anybody have quotes about photography in ww1? from observers? High ranking officers? Opinions? Is there any websites I could go to to find information on photogrpahy durin ww1? Its a rather broad subject, so give me anything you can.

thank you alot

Soppy