Several other artists have recorded this song. A couple of groups, Jerry Jeff Walker and most recently Steven Fromholz. I admit to being a life long Fromholz fan and he does a great job on this song. The CD is Steven Fromholz Live at Anderson Fair and it is the last song on the set. Styeven has a great website www.stevenfromholz,com and the lyrics are there.
I cannot find any information to speak of on Pat Garvey also spelled Garvy, the writer. Did he write or record anything else? I found him listed as singer on a song about the names of men on the Viet Nam Memorial Wall.