Hello,
Currently on ebay are a large number of photos from pilot Sgt Alexander Wilson, of the 157th Aero Squadron also including non aircraft subjects. Representative of many is a photo of Salmson 2 A2 No.3372 of the 99th Aero Squadron
https://www.ebay.com/itm/176550289161
The seller has many more photos,both of american and Entente aircraft as well as one or two captured aircraft
https://www.ebay.com/sch/i.html?_dkr...c=1&_nkw=157th
Regards,
Clint