Music for Piano for Left Hand compiled by Raymond Lewenthal - either for students who have temporarily or permanently lost the use of one hand, or for pianists of all levels (above approx Grade 5-6) who believe their left-hand playing is not as accomplished as their right (which may well include every pianist!).
These pieces vary in difficulty. Some are technical studies can be considered part of a programme of study, yet they are not just exercises; many of these pieces are extremely interesting and well-written and eminantly suitable for recital.
The book includes some very useful notes about the history of left-hand music and practice techniques.