Just some links when I looked around out of interest.
"Pocket Slide Rule"
- The Appeal of Slide Rules - For Use and as Collectables.
- Sliderule Types - Bob's Sliderule Site
- making your own slide rule
- The International Slide Rule Group - Yahoo Groups
- Oughtred Society Slide Rule Home Page.
- Calculating the Quality of Vintage Slide Rules - Collectors Weekly
- International Slide Rule Museum