Jenny,
The only way I can think to do this from Publisher is to print the
publication to a PDF printer or the "Microsoft Office Document Image Writer"
(if you have office 2003), and save (export) the file off as EPS or TIF
images (the choice of format would depend on how the final output would be
run) so you can place them as thumbnails in a new document. If you need me to
elaborate, please post a follow up, as instructions would be dependant on the
versions of software you have and how you will do final output (commercial
press, on line PDF, or just to an office laser printer).