Some of the difficulties that have to be faced, in engaging in such a task, have been obvious from the first, and others have been felt more clearly as the work progressed. The chief of these is due to the lack of information.

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This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations.

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it.

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