There are multitude of wonderful sources of history on
the world wide web. This is one of the best all around sites
that I have found. It is titled "The MacTutor History of Mathematics
Archive."
http://www-groups.dcs.st-and.ac.uk/~history/
Here is another very good historical site:
http://aleph0.clarku.edu/~djoyce/mathhist/mathhist.html
This is an award-winning site that links
to all sorts of mathematics information.archives.math.utk.edu/
Earliest uses of various mathematical symbols:
http://www.symbols.net/math/
History of Mathematics by Region:
http://aleph0.clarku.edu/~djoyce/mathhist/mathhist.html
History of Mathematics Chronologically:
http://aleph0.clarku.edu/~djoyce/mathhist/chronology.html#toc
We have divided this history of mathematics
into six chronological periods, many of which are included
at the following world wide web sites.