In its repetitions and verbal formulas the poem retains the qualities of oral transmission. The tone of the work has been compared with Greek tragedy.

Reprint of the original, first published in 1872.

Reprint of the original, first published in 1862.

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.