Unfortunately I'm not a paper conservator and our archivist is not at
work today, but, yes, depending on how many rolls you're talking about,
freeze drying might be the best option.  Some expansion is likely to
take place with any drying method, but the least expansion will occur
with freeze drying.

Some other Internet resources that might be of interest:
http://aic.stanford.edu/library/online/disaster/tentip.html and
http://www.heritagepreservation.org/PROGRAMS/SaveTreasuresRightWay.htm 

Nancie Ravenel - Objects Conservator
Shelburne Museum
Shelburne, Vermont
http://www.shelburnemuseum.org/