Sonsorol Island - An indepth study of Sonsorol island including history, maps and over 400 photos. - http://www.sonsorol.com
University of Texas Libraries - Republic of Palau Maps - Country and thematic maps from the Perry-CastaƱeda Library Map Collection, along with links to maps on other web sites. - http://www.lib.utexas.edu/maps/palau.html