NavSource Online - BB-57 facts and annotated images. - http://www.navsource.org/archives/01/57a.htm
Great White Fleet - BB-49 history, specifications, and images. - http://www.greatwhitefleet.org/southdakota/02/history.html
Naval Historical Center - BB-57 history and annotated images. - http://www.history.navy.mil/photos/sh-usn/usnsh-s/bb57.htm
U.S. Navy Battleships - USS South Dakota (BB 57) facts, history, and images. - http://www.chinfo.navy.mil/navpalib/ships/battleships/sdakota/bb57-sd.html