The Collaborative International Dictionary of English v.0.48:

Booker \Book"er\, n.
   One who enters accounts or names, etc., in a book; a
   bookkeeper.
   [1913 Webster]

WordNet (r) 3.0 (2006):

booker
    n 1: someone who engages a person or company for performances
         [syn: booker, booking agent]

U.S. Gazetteer Places (2000):

Booker, TX -- U.S. town in Texas
   Population (2000):    1315
   Housing Units (2000): 541
   Land area (2000):     1.043362 sq. miles (2.702296 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    1.043362 sq. miles (2.702296 sq. km)
   FIPS code:            09448
   Located within:       Texas (TX), FIPS 48
   Location:             36.453926 N, 100.538125 W
   ZIP Codes (1990):     79005
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Booker, TX
    Booker