How can I crop pdf pages?

[Mike]

I need to crop some pdf pages before placing them into inDesign.

Using the crop facility in Acrobat doesn't seem to actually delete the cropped area which becomes visible again once the file is placed into inDesign so I need to find a way of actually deleting the cropped material.

The problem arises because I have three novels that are to be republished as a single volume. Each of the novels is only available as a pdf but the running heads are inconsistent and are, of course numbered within each novel. So I need to remove the original crop marks, running heads and page numbers before placing them in inDesign.

Once in inDesign I'll be adding new running heads and other material.

One minor point - the whole lot is supposed to go to press next week so any advice will be very welcome.