Here are a few helpful resources:
http://landscaping.about.com/od/weedsdiseases/qt/kill_crab_grass.htm
http://www.bayeradvanced.com/article/crabgrass.html
thttp://www.acehardware.com/product/index.jsp?productId=1747271&CAWELAID=323716799
http://www.scotts.com/smg/brand/roundup/brandLanding.jsp
http://landscaping.about.com/od/weedsdiseases/qt/kill_crab_grass.htm
http://www.bayeradvanced.com/article/crabgrass.html
thttp://www.acehardware.com/product/index.jsp?productId=1747271&CAWELAID=323716799
http://www.scotts.com/smg/brand/roundup/brandLanding.jsp