How can I reduce size of Highest level disc Library?

I'm trying to reclaim space on my hard drive and have backed up everything I can work without on a daily basis, to another drive and erased it from my internal drive.
My Library is 39 gigabytes and my drive about 100G (92 per About the Mac). This is the library at the top level of the disc along with Applications, Developer, System and Users folders. (My user library is only 1.67G, and my System Library is 3.77G) Is there some way to reduce the size of this file without creating more problems?
I just realized there are THREE libraries on my Mac, not two so I'm really confused about the specific function of each level library.
Micki
Message was edited by: AHG Micki to correct the library I was referring to.

Gee, and I thought my /Library was a bit excessive at 15GBs! I would guess you have a whole lot of support files in there for some programs. If you don't use the program, for instance GarageBand, you can remove its support files. Open the /Library folder, put it into List view, then go to View menu and check the Size column and, at the bottom, check calculate all sizes. Now click the Size column header and the items will be arranged by size. Click the disclosure triangle in front of a folder to see its contents, which will also be arranged by size, and see where all the stuff is. In my /Library folder the biggest sub-folder is Audio, at almost 8GBs. Most of that is taken up by the sub-folder Apple Loops, and most of the loops are for SoundTrack Pro. Next biggest is Application Support, which has 2GBs of sound files for GarageBand. Then comes Printers, which I have trimmed down to 2GBs by tossing all the support files for printers I don't own and have no intention of ever buying under any circumstances (Lexmark and HP for example). And so on. Investigate to see what you've got in the /Library folder, and whether the things that are there are for programs you actually use.
Francine
Francine
Schwieder

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