The Air Force in the Vietnam War

I have the PDF file, can't beat the price as it's freely downloadable.

This is an almanac or compendium providing a very high level overview of USAF operations during the Vietnam War. It's well designed, providing statistics by year and photographs of most of the aircraft operating in theater. Along with the photographs, a brief description of the aircraft's role during the conflict is provided. Having read numerous accounts of the war, seeing photos of the aircraft involved is very helpul.