Is there a way to see a list of unreachable revisions in Bazaar?

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http://askubuntu.com – If I do an uncommit, Bazaar gives me a revision id which I can use to retrieve the uncommitted revision, should I ever need it. If I don't write it down right after the uncommit, is there a way to find this revision id again? Similarly, if I delete a branch from a shared repository, the unique revisions of the branch remain in the shared repository, but how can I find their revision ids? Common in both of these cases is that the revisions are "unreachable", since they are not part of any branch. (HowTos)