Apple Numbers '09 - Manual (Page 235)

Chapter 10 Adding Address Book Data to a Table 235
The table contains a column for each Address Book or vCard field named, as “Mapping
Column Names to Address Book Field Names” on page 231 describes. However, only
fields named Last name, First name, Phone, and Email are initially visible; the other
columns are hidden. To view the hidden columns, choose Table > Unhide All Columns.
You can delete or rename columns as required.