He has a number of other albums from that period that were recorded but never released. Off the top of my head I think they are:
Homefires (from 1974)
Oceanside Countryside (c.1976 or 1977)
Chrome Dreams (1977)
Most of the songs ended up on other albums (sometimes decades later) but there are one or two that haven't appeared officially anywhere.
There's also a Crazy Horse collaboration from the early 2000s called Toast that never got released.
He has a wry sense of humour because back in 2007 he released an album called Chrome Dreams 2 which had all recently written songs. He said he was bored of fans asking if the original Chrome Dreams was ever going to be released, but they could have CD2 instead.