Hi Professor,
Welcome to Apple Discussions
As a first time poster you may not have understood the message at the top of this Forum in big red letters. We talk about the Forums in here, not hardware or software questions.
However, what I would do is load the BMPs as graphics in a word processing package (I'm using Pages) and then use OS X Print option to save as a PDF.
I see you're on OS X 10.2 so a good place for further advice would be
Mac OS X v10.3 & earlier, possibly the Printing & Faxing Forum?
Regards,
Colin R.