Original: It was released in two different versions, both of which are still in print: the original version in 1977 and the revised U.S. version in 1979 (with several post-1977 single sides added to the album).
Simplified: Both releases are still in print: the original version in 1977 and the changed U.S. version in 1979 (with several post-1977 single sides added to the album).