Wolfram Research
Wolfram Science World: Karl Friedrich Gauss (1777 1855)
A comprehensive summary of Gauss work, primarily mathematical. An incredible number of hotwords, along with many links to other scientist and mathematicians.
University of St. Andrews (UK)
University of St. Andrews: Johann Heinrich Lambert
This page, which is provided by the University of St Andrews, offers a short biography on Johann Heinrich Lambert, a French-German mathematician (1728-1777.) It discusses his life and his contributions to mathematics.