It is best to have them in the file, and because I've made hundreds of public file maps I've not run accross a situatiion where they couldn't be there.
However, when a request is made the bank has 24 hours in which to provide the information. Which IMO would be ample time to print out the maps and forward them to the person making the request.
Just FYI we have put maps on Cd's for people but seems like the CD's get misplaced a lot.
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