Nonprofit literacy organizations and charities promote books to eager readers nationally and internationally. Working with them can help you expand your target audience.

Better World Books
http://www.betterworldbooks.com/
capitalizes on the value of the book to fund and support literacy initiatives –  .

Reading is Fundamental
http://www.rif.org/
Oldest and largest children’s and family nonprofit literacy organization in the U.S.; delivers free books and literacy resources to those who need them.

Silent Images
http://silentimages.org/
Images seeks to educate others and tell the stories of persecuted people around the world through journalistic photography, video, and writing.
The book Voices of Sudan by David Johnson is a leading resource in their educational efforts.