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Palm’s PDB and PRC formats are not only used by Palm, butl also by e-book reader on Symbian and even desktop PC. Here are some description on its format:

NS Basic/Palm PDB File Structure
http://www.nsbasic.com/palm/info/technotes/TN02a.htm
The PRC Format

http://web.mit.edu/tytso/www/pilot/prc-format.html

Other related resources:
Palm emulator on Mac
BookDesigner – A tool to create PDB/PRC file?