Larry:
Starting in June 2005, Military Machines International did a multipart history of GAZ. I am missing the first three installments but I remember the A, AA and AAA were well covered in one of the first three. They have a website,
www.militarymachinesintl.com where you can order back issues or just contact them or perhaps the author of the series.
I have to work only two days this week and then multiple days off so I will try to sort through my books/photos for a shot without the tilt up.
Bill