Chopping up a PDF

[Robert Crawford]

All of my manuals for work come in PDF format now and I am getting 
tired of waiting for my work laptop to boot up whenever I need anything 
(worse, it is win 2k).  I want to take just the useful portions out of 
these PDF files and make a single file.

So, out of about 12 manuals, about 900 pages each, I want to extract 
12-14  pages from each and make a single document.  How would I go 
about doing this?