This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
I don't know the exact table name, but you should either search google for "Oracle meta data tables" or just use a graphical viewer to see the full list of system tables in the database. I believe the user tables start with "user_"