I have found myself being quite nostalgic lately. I have been using logos for over two decades but it wasn't until this year that I decided to get serious about reducing my paper collection of books. Earlier this year I gave away around 2,000 volumes to various people and organizations. This weekend I've been going through the files that I have collected over the past 4 decades with the goal of only keeping what is absolutely the best. I may scan some and make them into PB at some point.
Going through the process has reminded me of how I used to organize my library. I used the New Baker's Textual and Topical Filing System. It is still even available for purchase on Amazon - http://www.amazon.ca/Bakers-Textual-Topical-Filing-System/dp/0801069181 It was an amazing system that would allow me to retrieve almost anything that I had filed in a matter of less than a minute. I loved it an used it for diligently for years.
Those days are now officially gone now, although I remember them with fondness. Logos is so far superior I hardly miss it.
Which brings me to my question...how did you organize your library prior to Logos?