This book was published in 1927 by The MacMillan Company. The edition has a copyright notice and was registered with the U.S. Copyright Office in 1927 and subsequently renewed in 1955.

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The author, James Duff, died in 1935, which is more than 70 years ago. In The Netherlands and the European Union, where this site is hosted, copyright expires 70 years after the death of the author. This book is therefore also in the public domain in The Netherlands and the European Union.

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