A link might be useful

来源: 于 2008-03-25 17:27:00 [旧帖] [给我悄悄话] 本文已被阅读：次

Found a resource on the USCIS web. Don't know if it is out of date. Hopefully it helps a bit.

http://www.uscis.gov/files/nativedocuments/NSC_Filing_Tip_3_08_04.pdf