Department of Immigration Services
The following are useful links
Obtaining a passport
http://www.doyouneedvisa.com/passport/Niger
Online Visa Application
http://www.passportsandvisas.com/visas/niger-visa-faq.asp
Visiting Niger
Becoming a citizen
http://niamey.usembassy.gov/entryrequirement_niger.html
Green Card
http://www.migrationexpert.com/visa/united-states-embassies/niger
Countries which do not require Visa to Niger
https://answers.yahoo.com/question/index?qid=20090708134427AAzwcpH