The value of old print materials

I got to know of the Heritage Roadshow, thanks to Melissa.

Here's an excerpt that I have taken from the publicity website:

That old letter in your grandmother's shoebox could be worth hundreds and possibly thousands of dollars... Why not dig up old print treasures at home from maps to letters and books and bring them to the National Library for Singapore's very first Heritage Roadshow...Prizes will be awarded based on the 'value' or 'history' of your artefacts...

Heritage Roadshow : Heritage Donations @ Plaza

National Library Board

Venue: Level 1, the Plaza
Date: Sat 11 Nov - Sun 12 Nov (11am - 6pm on both days)

Check out: http://dl.nlb.gov.sg/victoria/2006/11/heritage_roadshow_heritage_don.html