Books about blood group and diet:

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Eat Right 4 Your Type:
Dr. D'Adamo's First Book on blood grouping and diet.

Live Right 4 Your Type:
Newer book by Dr. D'Adamo, includes different diets for secretor and non-secretor.

The GenoType Diet:
Latest book by Dr. D'Adamo, gives diets for the 6 GenoTypes.