old manuals and/or documentation

I'm looking for some "old" reference materials. The materials include either manuals, articles, training materials, college thesis, white papers, school tests, list servers or other information that is considered in the "Public Domain". This material could be purchased, referenced, reviewed, etc. by anyone. Internal company I'm doing some research for the recent Y2K patent regarding date windowing. The materials need to have a copyright date before October 1995. If anyone would have access to any of this material and willing to share via sending the book, making some copies, ISBN numbers, etc. I would be interested in conversing with you. Specifically the materials should show an example of the date window technique (any cutoff date will do), the use in a comparison and possibly the use in a sort. The word on the street is that the reference could be found in the Clipper manuals or I've seen some indication on a web page for Quicken for Macintosh (version 1, 2, or 3). The indication discussed the method Quicken uses but did not reference any manual. I was hoping someone had the manual and could locate the reference to it within the written pages. Your help will be greatly appreciated and I look forward to hearing from you soon. Please respond back if you have information to share. Tom Renz