Final answer:
The metaphor of the book represents all the writings of Western civilization and contributes to the meaning of the poem by showing how reading the books of myths is necessary before exploring the wreck of Western civilization.
Step-by-step explanation:
In the passage, the metaphor of the book contributes to the meaning by representing all the writings of Western civilization. By reading the books of myths, the poem's narrator gains knowledge and understanding that allows them to navigate and explore the wreck of Western civilization.