More web sites

http://www.trentu.ca/admin/library/archives/historyofphotography.htm

http://caraphillips.wordpress.com/2008/02/18/women-photographers-part-one/

http://www.lib.unc.edu/ncc/pcoll/wootten/index.html

http://www.massillonmuseum.org/wep/PDFtg/MM_JohnsonGuide.pdf