Here's a post with some references to taxonomy and categorization

http://www.strayshoppingcart.com/shopping_cart/2_uts.htm
a taxonomy

http://www.nytimes.com/2009/08/11/science/11naming.html?_r=1&pagewanted=all
on taxonomy

58.  There is Nothing Like a Nurse  (B-309)
     November 19, 1974
     Written by Larry Gelbart
     Directed by Hy Averback
     Guest Stars:  Jamie Farr, Loudon Wainwright III, Bill Christopher, Bobbie
                   Mitchell, Molli Benson, Jeanne Schulherr, Leland Sun

     The nurses are evacuated when the threat of an enemy parachute
drop arises.  Hawkeye and Trapper try to enliven everyone's spirits
with them gone.
Box labeled "Surgical Supplies and purple things"