PDF file to contain PDF files?

I have scanned in a pile of A5 size paper magazines ( non-copyright ), one mag per year and about 25-30 pages each issue.
The Finder contains one Folder for each year.
Each Folder contains about 25-30 pdf files and is about 6 - 16 MB
Each pdf file contains one or two scanned paper pages of text and is about 200 KB.
Some pdf files are bigger as they contain scanned photos - up to 8 MB each.
The file names are in ascending order of original page number.

One person I sent a Folder to has asked:
"The attachments you sent open with no problems except for the one labelled ATT01304.DS. This does not open.
It would of course be helpful if the individual pages could be combined into one pdf file per issue: the pages would then open in order.
I don�t know whether this would be possible for you, but it would certainly make them easier to access.
Also having the page numbers reflected in the file names would be very helpful."

I don't know or care what "ATT01304.DS" is - I assume it was added by software somewhere.
And I don't see why "having the page numbers reflected in the file names would be very helpful."
But I would like to be able to implement "the individual pages could be combined into one pdf file per issue: the pages would then open in order. "

I have seen links to "pdf merge" software such as
http://macintoshhowto.com/leopard/how-to-merge-pdf-f...
but only for fairly recent OS X.

Is there any way of putting several pdf files into one big pdf file?
Must be free and work on OS X 10.2.8 or 10.3.9, which are the most recent versions I can access.

PS What ever happened to "Macversion"?

Not tried it myself but this one claims it works on 10.3.9.

http://www.freewarefiles.com/Simple-PDF-Merger-V_pro...
I used this last year to merge individual chapters and pages into a 200 page book. The merged 'big' pdf was used to print the book. Worked perfectly.

You can drag PDF files a page at a time into Pages and then print out the document as a PDF

a bit tedious though

or select all the PDF documents and then double click to open in Preview then if you Print to PDF you get a document with all the different PDF docs in.

or at least that worked for me.

Many thanks to contributors for those several suggestions.

After initial trials it looks like the one most suited to my equipment is version 4.1 from
http://www.monkeybreadsoftware.de/Freeware/CombinePD...

This does seem to work OK with OSX 10.3.9 .
CombinePDFs41.dmg uses 4.1 MB on disk.

Just for interest, for those with more up to date Apple gear, there are other later versions of "CombinePDFs" on this web site.