Bureau of Immigration and Naturalization
Broad Street, Monrovia
http://www.directmeliberia.com/government/42-bureau-of-immigration-and-naturalization.html
The following are useful links
Obtaining a passport
http://www.mofa.gov.lr/public2/doc/Final_Copy_Passport_Form.pdf
Online Visa Application
http://liberia.travisa.com/ApplicationSelector.aspx?CountryID=LR&PartnerID=TA
Visiting Liberia
http://www.passportsandvisas.com/visas/liberia-visa-faq.asp
Becoming a citizen
http://www.worldtravelguide.net/liberia/passport-visa
Green Card
http://www.migrationexpert.com/visa/united-states-embassies/liberia
Countries which do not require Visa to Liberia