The links on the Treaties page in this guide will help you determine how many countries have ratified the United Nations and ILO conventions.
The Inter-Amercian Commission on Human Rights seeks to promote and support the rights of indigneous peoples in Latin America.
Two of the most famous cases relating to indigenous peoples in Latin America are Aguinda v. ChevronTexaco and Mayagna (Sumo) Awas Tingni Community v. Nicaragua. The former is a world-famous case of Ecuadorian indigenous communities in the Amazon against the oil giant, the other a case over land title in Nicaragua.
SOLO searches may well reveal that the Library of the Latin American Centre (Oxford) has useful material. To find out more about this Library please use link below.
Useful journals can be found at Internat 300 and at General 300. The journals below include useful articles:
Human Rights Quarterly: shelfmark General 300 H58 (also available online through SOLO)
Journal of Transnational Law and Policy: shelfmark Internat 300 J128 (see vol 19, 2009)
The American Journal of International Law: shelfmark Internat 300 A100
See also numerous relevant and current (2012 / 2013) articles on the BBC website on Latin American indigenous peoples.