http://www.udel.edu/biology/ketcham/microscope/

http://www.kbears.com/sciences/microscope.html

http://school.discoveryeducation.com/lessonplans/interact/vemwindow.html

http://www.wisc-online.com/Objects/ViewObject.aspx?ID=BIO905

http://www.norweco.com/html/lab/microscope.htm#

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