Possible Clues:

• Line by Italian, earl translated word for word
• Without exaggeration
• According to the letter I got in mail finally, later revised
• Nonmetaphorical
• Exact lines retaining appeal over long period
• Misprint in a line added to American volume
• "Heard on the shore"? It's a misprint
• Not metaphorical or figurative
• Short literature may be real, and strictly interpreted
• Lacking imagination; misprint