http://homepages.gac.edu/~arosenth/160/Outline_of_The_Republic.pdf

http://faculty.cua.edu/hoffmann/courses/201_1068/Plato-4%20Outline%20Rep.1.pdf

http://people.wku.edu/jan.garrett/outlplat.htm

http://thewinetastingclub.blogspot.com/2008/03/outline-of-platos-republic_18.html

Two excellent pieces on the REPUBLIC in the SEP:

http://plato.stanford.edu/entries/plato-metaphysics/

http://plato.stanford.edu/entries/plato-ethics-politics/