See also:
- Recreation: Collecting: Computers: Calculators (35)
- Science: Math: Education: Slide Rules (15)
- Science: Math: History (118)
- Science: Math: Software: Calculators: Slide Rules (3)
Peter Owen, Collector of Slide Rules
homepages.tesco.net
Texts and photographs.
Peter Holland's Slide Rules
peterholland.de
In German and English. Items for trade with descriptions of condition.
Kung's OnLine Slide Rule Bookmarks
geocities.com
An annotated collection of links.
The Slide Rules
giovannipastore.it
A hyperlinked history of slide rules, details of the author's personal collection, and contact information.
Slide Rules
eyrie.org
Dedicated to one man's collection of slide rules (and includes a photo gallery), plus a few links for those who want to find out more about them or where to buy one.
The Sphere Research Slide Rule Archives
sphere.bc.ca
Slide rule model information, pictures, and history from all over the world.
SlideRule Trading Group
groups.yahoo.com
Private trading for members of the group.- Discovering Slide Rules
sphere.bc.ca
Relates a story about how one person found a giant cache of new-in-box slide rules. 
Slide Rules and Calculators
chris.gillings.com
Images grouped by type.
Chris Osburn's Calculating Instruments
sliderule.mraiow.com
Classifies and lists slide rule and scales. Grouped by type, size, country of origin and manufacturer. Articles, a discussion forum and a section on buying and selling.
The Slide Rule Guy
slideruleguy.com
Site for Jay Francis, a collector of slide rules and antique mechanical calculators. Items for sale or trade, and many related links.
Model Aircraft Performance Slide Rule Calculator
pages.sbcglobal.net
Custom slide rule for sale. Online calculations which cover the same functions available on the site. Manual included with the slide rule.
Slide Rules from German Manufacturers
gaehrken.de
A collection of slide rules, with descriptions and pictures. Also, some links to other slide rule sites.
Slide Rule Museum
sliderulemuseum.com
Dedicated to engineers past and present, this collection of slide rules and manuals have in excess of 1000 different items scanned full size and categorized by company or continent. Also offers a glossary of slide rule terms and links.
The Oughtred Society
oughtred.org
Membership group dedicated to the history and collection of slide rules.
Otis King's Patent Calculator
svpal.org
Probably the most complete collection of Otis King's Patent Calculator (cylindrical slide rule) information on-line.- Slide Rules in Thailand
geocities.com
Front and back images of some slide rules for sale. 
HP Museum - Early Calculators
hpmuseum.org
Some non-HP calculators that were introduced anywhere from centuries ago to the late 60's.
Slide Rule Collection
toddtolhurst.com
Todd Tolhurst describes his collection, some with pictures.
Slide Rule Page
home.att.net
Archives of photos of large personal collection.
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