Robert Parrish - Antique Surveying Instruments  (Great Repair and Parts Source)

Virtual Museum of Surveying

Kern History
This is a great site that has a ton of data about Kern that has been compiled by previous employees of Kern in Aarau.  They have saved many documents, instruments, photos, and much more information.  They can also help you date your Kern instruments. 

This website is currently in German but can easily be translated using Microsoft's Bing Translator.  If you are using the newer Internet Explorer web browser just right click on the page and pick "Translate With Bing".  

N.O.A.A. History

Surveying - Smithsonian Institute

Bud Uzes Instrument Collection (New Location)

Clark McCoy's K&E Catalogs And Slide Rule Information

Early American Measures - Weights, Scales, Liquid Measurers, Yardsticks, Tools and Related Documents
 

More to Come!