Not to argumentative, but I question the inclusion of about half of the groups mentioned as Country Rock.

The Outlaws, Allman Brothers, Missouri, Lynyrd Skynyrd, Barefoot Jerry and the Charlie Daniels Band are certainly Southern Rock, aka Redneck Rock.

I'm not sure where to put Mason Proffitt and the Ozark Mountain Daredevils.

Nitty Gritty Dirt Band predates Country Rock, being started in 1965. Folk Rock?

One of the most successful Country Rock groups, from a commercial point of view, was Rick Robert's group Firefall.