Partial checkouts

I have a project with some files and directories and one Really Big
Directory that I don't want to check out. I thought I might be able to
accomplish this as follows:

  svn co -N http://svn.newt.com/foo/trunk foo
  svn co http://svn.newt.com/foo/trunk/a foo/a
  svn co http://svn.newt.com/foo/trunk/b foo/b
  svn co http://svn.newt.com/foo/trunk/c foo/c
  ...

However, I get the following error on line 2:

  svn: Working copy 'foo/a not locked

What would be less verbose is something like this:

  svn co --exclude ReallyBigDirectory http://svn.newt.com/foo/trunk foo

Suggestions?

-- 
Bill Wohler <wohler_at_newt.com>  http://www.newt.com/wohler/  GnuPG ID:610BD9AD
Maintainer of comp.mail.mh FAQ and MH-E. Vote Libertarian!
If you're passed on the right, you're in the wrong lane.
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