[Orgmode] Repeating tasks in an interval

[Robert P . Goldman]

Is there some way to specify a repeating task over an interval?  That is a task
that is done, for example, every month, over a finite period?

Here's an example that I tried:

DEADLINE: <2009-12-01 Tue +1m>--<2009-11-01 Sun>

But this one doesn't work --- the tasks keep appearing after November ended.

Is this possible?  Do I just have the wrong syntax?  Or must I do this with C-c
C-x c (cloning)?

thanks,
Robert