National Museum of American History
http://americanhistory2.si.edu/surveying/

The American Surveyor Magazine
http://www.theamericansurveyor.com/
 
SIS Scientific Instruments Society
http://www.sis.org.uk/

Virtual Museum of Surveying
http://www.surveyhistory.org/

Rittenhouse Journal of the
American Scientific Instrument Enterprise
http://www.rittenhousejournal.org/

The Gemmary
http://www.gemmary.com/