Includes numbers 3, 4, 6, 7,8,9, 10 and 11 in the series.  Books are all holding together well at the binding except the blue #4 has a 2" split where the cover meets the spine.   All should be considered to have some kind of wear including scuffs, creases or some form or light paper loss.   All books have the previous owners initials written inside.  All books are first printings.