USCIS - Tips for Filing Petitions and Applications to the ...
I-797 Receipt or Approval Notice in support of the filed form. ... Evidence of Eligibility (I-797, Notice of Pending/Approved I-130/I-129F, ...
http://www.uscis.gov/portal/site/uscis/menuitem.5af9bb95919f35e66f614176543f6d1a/?vgnextoid=72a927c382f39110VgnVCM1000004718190aRCRD&vgnextchannel=c88fd1eb6dc43210VgnVCM100000082ca60aRCRD