It is revealed that Ward is a "Junior" when Beaver gets Ward's library card.
The scenes of The Beaver and Larry in the public library are introduced by a 'stock-footage' shot of the Free Public Library located at 4th and B Streets in in Petaluma, California, USA. The 1904 building, originally a Carnegie Free Library, has been re-purposed as a Research Library and Museum, and is on the National Register of Historic Places.
As The Beaver is looking through the bookshelf in the den to choose a book to read, one of the books he bypasses is "Facts of Life and Love for Teenagers" (New Revised Edition), by Evelyn Millis Duvall (New York: Association Press, 1950, 2nd Edition, 1957). Later, when The Beaver is talking with Ward in the den, John Brick's novel, "Jubilee" (New York: Doubleday, 1956) is clearly seen on a bookshelf over Ward's left shoulder.
The book Beaver selects from Ward's bookshelf is the William Hickling Prescott historical tome "Conquest of Mexico," first published in 1843, which as the title implies conveys a history of the Spanish conquest of Mexico, as well as a study of the Aztec and other indigenous peoples of pre-Columbian Mexico.