Your poem is pretty mysterious. The first stanza sounds like it's about someone's mother's old schoolbook, but the lines, "It smells perfect / Each unbleached page" are a perfect description of the way new books feel and smell. At first that led me to think it was an old book that was never used, but I realized that wasn't the case at the end, when you mention it was written in.

I think your poem would read better without the "Under / Grad / Under / Line / Under / Grass" lines because they are confusing and detract from the nostalgic atmosphere of the poem.