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It is rather difficult for me to review this excellent book not because there is too little, but because there is too much to say about it. I happen to have worked in a neighboring area shortly after Dr. Fortune and therefore not only appreciate the quality of his work in general but also in detail. Duau and Dobu are closely related to each other but not identical. It is therefore quite possible that whenever our data do not agree local differences may be the cause. Thus, for