Possible Clues:

• Put another E back on poetry
• It's the wrong way to put another E on all those poems
• Mythological stories from collected Danish lore
• The wrong way to put on another E to the poetic collection
• Collection of old Norse poems
• Icelandic reading
• Editor has publicity circulated for poetry collection
• Old mythological work
• Collection of poems briefly summed up
• Theologian delves into each book of mythology