The following provides some news and information on Roundup mosques:
http://roundup-mt.yellowusa.com/Mosques.html
http://www.superpages.com/yellowpages/C-Mosques/S-MT/
http://www.sacred-texts.com/isl/hadith/had08.htm
http://www.islamic-world.net/countries/united_states.htm
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About Roundup, USA
Roundup is a city in and the county seat of Musselshell County, Montana, United States. The population was 1,931 at the 2000 census. (Source: http://en.wikipedia.org/wiki/Roundup,_Montana)