I'm having the same disappointment! I just looked up Alberto Manguel on Wikipedia; his book "A History of Reading" is on the reading list for a class I'll be taking this summer and I was excited to see a non-Anglo name there. He was born in Argentina, became a Canadian citizen, and now lives in France. But from the brief bio, I would bet his family's background was colonial era settlers, not the indigenous people of the region. Oh well.