The poem's subtitle, below, adds to the development of the entire poem mainly by (You never know what troubled little girl needs a book)

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suggesting that she (the speaker in the poem) prefers hardcover books to paperbacks

setting up (preparing to show) how important Mrs. Long would be to the speaker

pointing out how difficult it was for the speaker to access books when she was a child

explaining that no one had any idea of what the speaker was going through

setting up (preparing to show) how important Mrs. Long would be to the speaker

Explanation:

The poem's subtitle reinforces the importance of the speaker and the experiences she has to tell. This establishes Mrs. Long as a central part of the poem, as it is she who will explain the subtitle, placing the reader in relation to the message emitted by the poem. In this case, we can say that the subtitle is important for the development of the poem, as it prepares Mrs. Long as the speaker, who will narrate the poem.

abater   ambary   ambery   baryta   baryte   bemata   betray   jarvey   ramate   ramjet

explanation:

those are all the possible words

they fear for their lives