Extracting directories from an ISO image, command line tool?

[Richard Owlett]

Environment:
Using dd I have copied physical [NO INTERNET AVAILABLE ;] Debian 
DVD's to
/media/distributionA resulting in
/media/distributionA/DVD1.iso
/media/distributionA/DVD2.iso
.
.
/media/distributionA/DVDn.iso
Goal:
Extract pool directory (and all of its sub-directories) resulting in
/media/distributionA/poolA/
/media/distributionA/poolA/contrib
/media/distributionA/poolA/main

What commands should I be looking at?
TIA