The cowboy genre is a neglected American art form. Nobody much reads Max Brand (Frederick Faust) much anymore.
Here's a robert service link...his poems are a hoot.
http://www.mochinet.com/poets/service/index.cgi
Have you ever read Billy Collins?
Not cowboy stuff, but some of the freshest poetry in print.
His stuff is like a blast of cool air blowing through a stuffy room.