Combining Multiple PDF Files
A user has reported that the URL we had indexed no longer works properly.
This link is offline until a volunteer finds a new, valid URL for the work and updates our site.

Harris, Steve
PDFzone
2004

Abstract:

In Acrobat 4, you open one PDF file. Then in the 'document' menu, choose 'insert file.' You’ll have to do this four times to bring your five documents together.