The Concise History of the People of Chelm
http://www.wzo.org.il/en/resources/view.asp?id=119

An American Website for Yiddish speakers, especially directed at young people
http://www.yugntruf.org/

An organization dedicated to the digitilization of Jewish archives in Poland
http://www.jewishgen.org/jri-pl/chelm.htm

The official website of Chelm. Includes historic data, but does not include information on the Jewish character of the city prior to World War 2.
http://www.um.chelm.pl/default.htm