Problems looking at the history of deleted branches

I sometimes need to look at the history of deleted branches---if
possible, the *complete* history of a deleted branch. (Specifically, I
need software to look at it so I can do repository conversion.) This
always causes me pain, possibly because I don't know how to operate
Subversion properly.

svn log <branch URL>

... doesn't work, of course, as the branch is dead.

svn log <branch URL> -r<some rev within branch>

... also doesn't work, as the path isn't in the HEAD.

svn log <branch URL>@<some rev within branch> -r<some rev within branch>

... works, but doesn't give me all of what I want.

svn log <branch URL>@<some rev within branch> -r1:<some rev within branch>

... works, even if the branch didn't exist within rev 1.

svn log <branch URL>@<some rev within branch> -r1:HEAD

... fails again. I was hoping specifying a peg revision would change
the meaning of HEAD, but that doesn't seem to be the case.

Even just a command that would let me figure out the last revision at
which the branch existed would be helpful. Right now, I'm basically
doing a binary search to figure it out.

Any help would be much appreciated!

-- 
Cheers =8-} Mike
Friede, Völkerverständigung und überhaupt blabla
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