http://en.wikipedia.org/wiki/United_States_Permanent_Resident_Card

http://www.usafis.org/

http://www.green-card.com/

http://www.usimmigrationsupport.org/greencard.html

http://www.usimmigrationsupport.org/

http://www.green-card-dv-application.org/

http://www.usa-green-card.com/GC_FormApplication.asp

http://www.h1base.com/content/greencardapplication

http://www.us-green-card-lottery.org/application.html

http://www.greencardbase.com/

http://www.visa2003.com/greencard/adjustment.htm