1. This provides a detailed outline of the sanctions imposed by the US on Iran as well as practical information about what can/can't be sent or received.
http://www.treasury.gov/resource-center/sanctions/Programs/Documents/iran.pdf
http://www.treasury.gov/resource-center/sanctions/Programs/Documents/iran.pdf
2. This resource through Peace Policy provides a brief background on US as well as UN sanctions on Iran today.
http://peacepolicy.nd.edu/2010/01/26/stalemate-a-short-history-of-sanctions-against-iran/
http://peacepolicy.nd.edu/2010/01/26/stalemate-a-short-history-of-sanctions-against-iran/
3. I used this source as well as the CIA world fact book on Iran to get population figures:
http://www.un.org/Depts/escap/pop/journal/v10n1a1.htm