Accounts of Conversions.

I don't know quite how to phrase this- I was wondering whether anyone knew of any 'anthropological' accounts of conversions undergone by native people under missionary/colonial influence.

I think an account of what people suffering this type of conversion would be fascinating- what was it that convinced them their previous 'folk' (?) beliefs were actually wrong? Did they retain any of their old faith? Did any philosophy/consideration come into it at all or was it based on power/wealth etc.?
If anyone knows of any books containing accounts of this, either as part of an anthropological study/work of literature/testimonial account I'd be really interested.

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