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My publisher has kindly allowed me to leave many questions of copyright to him, but I Wish, not the less — rather the more — to thank all those authors and publishers who have permitted use of their material and whose names will, in many instances, be found incorporated in the text or in the accompanying footnotes. I have not thought it necessary in every instance to give a reference to volume and page, though occasionally, for some special reason of my own, I have done so.
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