Other "forgotten" country from the 60s and 70s along the lines of Willis Alan Ramsey?

If you aren't familiar with Willis Alan Ramsey, he put out one album in the early 70s and then effectively disappeared. It was largely forgotten until the 21st century when people came to appreciate just how good (and ahead of its time) it was.

Had a gritty, stripped down sound that other outlaw singers in the 70s would continue and perfect, but it's so great. Not an ounce of fat on the album. Wondered if there are other similar "ahead of its time" albums from the late 60s and early 60s that are equally good and were equally forgotten.