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According to an online description, Miss Library Lady, published in 1954 is a "career romance for young moderns" in which Jean, a new and idealistic children's librarian, meets Mr. Right on the bus by trying to see what book he's reading. Of course, he's engrossed in Rabelais, and she's only perusing a book of pictures from Spain, because it would never do to have our heroine appear too brainy, even though she may be a little "bookish."
I'm happy to report there seems to be a whole series of these books, including Nancy Runs the Bookmobile, Library Life for Deborah, Molly Qualifies as a Librarian, Librarian With Wings, and Loveliest Librarian.
It's enough to make me swear off buns and glasses for the rest of my life.