To be honest, I don't know for sure. I've asked my dad and he doesn't remember who even killed which buck. In the bigger picture, mostly between 10 and 20 years ago. The euro buck was an owyhees buck about 9 years ago, and that was the most recent.
The picture was taken because the 3rd from the left (with the guy leaning over behind it) was a deadhead that my dad found and he just threw it in the shed. One of his friends stole it and had it mounted. My dad was just sick because he thought they were gone forever. So his buddies took this picture with most of the biggest bucks they've killed over the years and sent it to him. He didn't even recognize this buck until they told him, now its hanging up is in house. That's what friends are for.