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	Eric Marcotte, a Slide Rule Collector - http://www.sliderule.ca/ A personal compilation of information on slide rules with much information on his own collection.
	The Oughtred Society - http://www.oughtred.org/ Membership group dedicated to the history and collection of slide rules.
	HP Museum - Early Calculators - http://www.hpmuseum.org/prehp.htm Some non-HP calculators that were introduced anywhere from centuries ago to the late 60's.
	The Slide Rules - http://www.giovannipastore.it/index_english.htm A hyperlinked history of slide rules, details of the author's personal collection, and contact information.
	Slide Rule Universe - http://www.sphere.bc.ca/test/sruniverse.html Includes on line archive of slide rule information, plus a catalog of available rules.

	Slide Rule Museum - http://www.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 International Slide Rule Group at Yahoo! - http://groups.yahoo.com/group/sliderule/ A community of slide rule enthusiasts. Several hundred posts a month.
	IM2001 - 7th International Meeting for Slide Rule and Calculating Machine Collectors - http://www.rechenschieber.org/ Munich, Germany, September 14 - 16, 2001.
	Slide Rule Trade Offer - http://www.arch.ced.berkeley.edu/kap/background/kapoffer.html An offer to trade kite aerial photographs for slide rules.
	Chris Osburn's Calculating Instruments - http://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.

	Otis King's Patent Calculator - http://www.svpal.org/~dickel/OK/OtisKing.html Probably the most complete collection of Otis King's Patent Calculator (cylindrical slide rule) information on-line.
	Slide Rules - http://www.eyrie.org/~dvandom/slide/index.html 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.
	Sphere Research's Learning about Slide Rules Site - http://www.sphere.bc.ca/test/2learning.html Repository for information, pictures, history and links to sellers, other sites and experts, and an online store.
	The Sphere Research Slide Rule Archives - http://www.sphere.bc.ca/test/2archives.html Slide rule model information, pictures, and history from all over the world.
	Napier's Bones and the Genaille-Lucas Rulers - http://www.nmt.edu/~borchers/napier/napier.html Presents Napier's Bones and the Genaille Lucas rulers in ready to print forms: Postcript and PDF.

	Slide Rule Page - http://home.att.net/~jcurrent/srule.htm Archives of photos of large personal collection.
	House of Slide Rules - http://foraker.research.att.com/~davek/slide/ Large categorised collection with photos and notes.
	Slide Rule Collection - http://www.toddtolhurst.com/sliderules/index.html Todd Tolhurst describes his collection, some with pictures.
	The Slide Rule Guy - http://www.slideruleguy.com/ Site for Jay Francis, a collector of slide rules and antique mechanical calculators. Items for sale or trade, and many related links.
	Sphere Research's Slide Rule Universe - http://www.sphere.bc.ca/test/swap.html Online sales and swap meet. Private individuals only.

	Peter Holland's Slide Rules - http://www.peterholland.de/ In German and English. Items for trade with descriptions of condition.
	The Death of the Slide Rule - http://www.dotpoint.com/xnumber/hp.htm Hyperlinked essay with citations by James Redin covering the rise of the portable calculator and the demise of its predecessor.
	Slide Rules from German Manufacturers - http://www.gaehrken.de/sr/index-e.html A collection of slide rules, with descriptions and pictures. Also, some links to other slide rule sites.
	Slide Rules and Calculators - http://chris.gillings.com/collect/slide/index.html Images grouped by type.
	Giovanni Breda's Slide Rule Collection - http://www.sliderule.it Giovanni Breda shows his collection. A sheet for each rule is provided including high resolution images. Links to other collector's site are also provided.

	Discovering Slide Rules - http://www.sphere.bc.ca/test/discover.html Relates a story about how one person found a giant cache of new-in-box slide rules.
	Peter Owen, Collector of Slide Rules - http://homepages.tesco.net/physics/ Texts and photographs.
	Model Aircraft Performance Slide Rule Calculator - http://pages.sbcglobal.net/limeybob/ Custom slide rule for sale. Online calculations which cover the same functions available on the site. Manual included with the slide rule.
	David Crate's Slide Rules - http://www.amug.org/~puppy/ Assorted slide rules for sale as well as some historical information.
	Space Race Slide Rules - http://www.nasm.si.edu/galleries/gal114/SpaceRace/sec300/sec320.htm Features some slide rules used in early American and Soviet space programs.

SlideRule Trading Group - http://groups.yahoo.com/group/sliderule-trade/ Private trading for members of the group.

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